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2.2.Remote Control w/ OLED Display

OLED Interactive Navigation

The OLED display is designed to work interactively in a simple and intuitive manner with the handheld Apple remote control.  Being a graphic display, the OLED can display a wide range of text, numbers, lines, and images. These capabilities are used to good effect to enable the user to easily configure and control the V25 Preamp Controller and V25 based preamps.
Apple Remote - OLED Display

Powering Up The Preamp (Boot-up)

Any time electric power is applied (not to be confused with turning the preamp on and off – see below) to a V25 preamp it takes approximately 5 seconds for the preamp controller to go through a boot-up process. During the boot-up process nothing will be displayed on the OLED screen. When the boot-up process is completed the OLED screen will briefly display a turtle (a “tortuga”)  which then fades to black. At this point the preamp is ready to be turned on and operated normally.

Turning The Preamp ON

Assuming the preamp is already powered, you can turn on the preamp either by: 1) briefly pressing the Menu button on the remote, or;  2) briefly pressing in the encoder control knob on the front panel.

When the preamp turns on you will see the words “Tortuga Audio” briefly displayed and then fade to black followed by the display showing the default Volume Control display with the preamp starting out being Muted and then the volume ramping up to the level it was at when last used but in no event greater than the Max Volume setting.

Turning The Preamp OFF

You can turn on the preamp either by: 1) using the remote to select the Off menu item and then press the Enter button to execute the turn-off process, or;  2) press/hold-in the encoder control knob on the front panel for between 3 and 5 seconds and release.

LDR300.V25 Buffer Output Delay

The LDR300.V25 Buffered Preamp has a separate built-in 10 second delay which disconnects (mutes) the preamp output for 10 seconds each time power is connected to the preamp. The same 10 second delay happens again each time the preamp is turned on. Therefore you may notice that even though the OLED display indicates the preamp is no longer muted  after turning it on,  the 10 second buffer output delay timer may still be running keeping the output muted. This is normal. The buffer output delay is there to protect against bumps and pops during power/turn on/off transitions.

Control Menu

The diagram below provides an overview of all the OLED control menu items and their associated control actions. At the end of this section the menu items and control actions are listed and described in more detail in tabular form.

The most basic operation of the OLED/remote is navigating up and down the Control Items menu tree using the Raise/Lower buttons on the remote. As the user moves up and down the Control Menu Items tree the OLED screen will display the name of each menu item. The user may select any Control Menu Item on the menu tree by pressing the Center button on the remote. Selecting a Control Menu Item will switch the display to the Control Action Display associated with that Control Menu Item. The user may then interact with the Control Action Display to change a control setting, adjust an option, or view some information  that in each case is unique and specific to the menu tree Control Menu Item.

Menu Changes as of Firmware Version 220

The control menu shown below is the current control menu as of firmware version 220 released on February 27, 2018. Preamps with earlier firmware will differ slightly from this menu. Preamp owners may elect to update their firmware to the latest firmware version. Please consult the Firmware Updating section of our online documentation for more information.

Starting with release of the version 220 firmware, the Calibration (Cal) and Impedance (Imped) menu items were combined into a single Imp-Cal menu item. This change all but eliminates the possibility of the user accidentally starting a calibration cycle unintentionally. After selecting the Imp-Cal menu item, the user is presented with the impedance control action display which allows for adjusting the impedance setting/level. Calibration of the currently selected impedance setting/level is then started by pressing the Mute button (this is new). Once calibration is started the calibration control action/view is displayed. While in the calibration view, the user can stop the calibration process at any time by either pressing either the Enter or Menu button. 

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Control Menu Items

The control menu items are a list of textual menu items that are displayed on the OLED display that the user can scroll up and down from which to choose an associated control action.  The control menu tree currently only has one level. In the future, control submenu items may be added to certain main menu items but, as with the main menu items, these submenu items would be solely for purposes of navigating to and selecting an associated control action.

Pressing the Enter button while viewing a control menu item will cause the preamp to switch to the corresponding action display.  The one exception to this rule is the top level Off menu item. Pressing the Enter button when viewing the Off menu item will turn off the preamp.

In general, pressing the Menu button while viewing any control menu item will revert control action back to the default Volume, Balance and Muting Control Action shown in the red box.

Control Actions

When a control action is selected the OLED display shows information specific to that control action and buttons such as Raise, Lower, Left and Right etc. allow the user to make changes to settings and controls that are relevant to that specific control action.

In general, pressing the Enter button while viewing a control action causes the preamp to leave the current control action and revert control back to the default Volume, Balance and Muting control action. In general, pressing the Menu button while viewing a control action causes the preamp to leave the current control action view and revert control back to the associated control menu list item.

Control Menu & Control Action Details

The following table lists each control menu item and its associated control actions along with a brief overview and specific remote command inputs associated with each control action.

Pleaes note that the information found below reflects the most current version of the firmware for the V25 preamps and may differ slightly if your preamp has older firmware. We encourage users to update their firmware to ensure the best performance.

Control Menu ItemControl Action DisplayControl Inputs/Actions
Off** Overview **
Menu item for turning off the preamp.

When this control is selected, a fading Tortuga is displayed followed by the ramp down of the volume. When the volume reaches zero, the preamp and display are turned off.

** Navigate **
Raise: Already at top of menu tree - blinks display
Lower: Switch to Volume menu item
Menu: Returns preamp to default Volume Control display

** Control **
Enter: Selecting this menu item turns off the preamp.
** none **There is no control action display assocaited with the Off menu item
Volume** Overview **
Menu item for selecting the default Volume Control Display

** Navigate **
Enter: Selects Volume Control Display
Up: Move up to Off menu item
Down: Move down to Input menu item
Menu: Escape to default Volume Control Display (same as Enter)
Volume, Balance, Mono & Mute Control** Overview **
This is the default control action display and is used to adjust the volume, adjust the left/right channel balance, select stereo/mono listening modes, and mute/unmute the volume.

Volume Display: Volume is shown both numerically and as a horizonal progress bar located under the volume number.

Channel Balance: Channel balance is shown as offset steps on either right or left side of display.
When fully muted, the word "Mute" will display across center of the display.

Mono Mode: When in Mono mode the word Mono will display in the upper right hand corner of the display.

Input: The upper left corner displays the current input number followed by the input label. If the default input label hasn't been changed it may appear as "1 Input 1". If the label has been edited, it may show something like "1 Phono" or "1 DAC". See Input for details on how to change the input.

** Navigate **
Enter: Single press does nothing - blinks display
Menu: Escape to Volume main menu item

** Volume Adjust **
Up: Increase volume up to maximum of step 100 (0 dB)
Down: Decrease volume down to minimum of step 1 (-60 dB). Further decrease mutes the unit and displays "Mute" in center of display

** Balance Adjust (active when the default Vol Display Balance mode has been selected) **
Left: Adjusts channel balance to the left up to maximum of 20 steps shown on left side of display
Right: Adjusts channel balance to the right up to maximum of 20 steps shown on right side of display

** Input Adjust (active when Vol Display Input mode has been selected) **
Left: Switch down to next lowest input # (if already at input #1 will roll over to max input number). If Vol Display mode is set to Input/Phase, this control is disabled and only the Right button will work.
Right: Switch up to next highest input # (if already at max input number will roll over to input #1)

** Mute/UnMute **
Play: Toggles between Mute and UnMute. Volume will ramp down to zero when muted and will ramp back up to prior volume level when unmuted. Once fully muted, the text "Mute" will display across center of the display.

** Mono Mode **
Enter (twice in a row): Toggles preamp between Stereo mode and Mono mode. "Mono" will display in upper right hand corner indicating unit is in monaural mode. Nothing is displayed in upper right corner when in normal Stereo mode.

** Phase Reversal **
Left: On balanced preamps with phase reversible inputs, which also have Vol Display mode set to Input/Phase, and in which Input #1 is active, pressing the Left button will toggle between normal and reversed phase. If the preamp is already in Mono mode, a box will appear around the word Mono on the display indicating preamp is in phase reversal. If the preamp is in normal Stereo mode, the word Phase inside a box will appear on the display indicating preamp is in phase reversal.

** Screen Saver **
The display will enter screen save mode 15 minutes after the last user command is received. This is not user adjustable and cannot be turned off. When in screen saver mode a Tortuga will repeatedly swim across the display from right to left. Pressing any key on the remote will clear the screen saver and normal display information will resume.
Input** Overview **
Menu item for selecting Input Change control action

** Navigate **
Enter: Selects Input Select Display
Up: Switch to Volume menu item
Down: Switch to Display menu item
Menu: Escape to default Volume Control Display
Input Change** Overview **
There are two different ways you can change inputs - fast mode and slow mode. In fase mode, inputs are switched immediately. In slow mode, volume first ramps down to zero, inputs are then switched, and finally volume then ramps back up to level last associated with the selected input. The volume last associated with each input is saved in memory. When you switch to a different input, the volume level is changed to the volume last saved with the selected input.

** Navigate **
Enter: Returns preamp to default Volume Control Display
Menu: Escape to Input main menu item
Mute/Edit (lower right button): Switch to Input Label Edit control action display

** Slow Input Change **
Up: Selects next higher input # but does not switch input
Down: Selects next lower input # but does not switch input
Enter: Locks in selected input and switches preamp to Volume Control Display. If selected input has changed, volume will ramp down to zero, the newly selected input will be connected, and the volume will then ramp back up.

** Fast Input Change **
Left: Immediately switches to next lowest input
Right: Immediately switches to next highest input
Input Label Edit** Overview **
By default, inputs are labeled sequentially as "Input 1", "Input 2", "Input 3"... etc. The user can easily edit these labels to be more meaningful such as "Phono", "DAC", "CD"... etc. by switching to the Input Label Edit control action display. While in Input Label Edit the user can add, delete or change each character in the label.

** Navigate **
Mute/Edit (lower right button) : While in Input Change control action display, pressing the Mute/Edit button will switch the preamp to the Input Label Edit control action display.
Enter: Returns preamp to default Volume control action display
Menu: Escape back to Input Change control action display

** Edit Label Commands **
Right: Moves edit cursor one character to the right. If already at last (right most) character, adds a new character "a" to end of label
Left: Moves edit cursor one character to the left
Mute/Edit (lower right button): Deletes last (right most) character in label
Raise: Changes character to next letter in the alphabet or next higher number between 0 and 9
Lower: Changes character to prior letter in the alphabet or next lower number between 0 and 9
Display** Overview **
Menu item for selecting Display Brightness & Timeout control action

** Navigate **
Enter: Selects Display Adjust Display
Up: Switch to Input menu item
Down: Switch to Cal menu item
Menu: Escape to default Volume Control Display
Display Brightness & Timeout** Overview **
Display brightness is adjustable between from 2 (dimmest) to 14 (brightest). Timeout refers to the ability to cause the display to turn itself off at the selected number of seconds if no command input is received fron the user. Any user command will cause the display to turn on again and resets the timer. Timeout only works when the Volume Control action is active and is disabled when the preamp is showing any other display. The Timeout period can be adjusted between 5 and 99 seconds. If set to less than 5 seconds the timeout feature is turned off. Changes to both Brightness and Timeout are immediately effective and saved.

** Navigate **
Enter: Returns preamp to default Volume Control Display
Menu: Escape to Display main menu item

** Brightness Adjust **
Raise: Increase brightness to max 14
Lower: Reduce brightness to min 2

** Timeout Adjust **
Left: Increase the timeout period up to 99 seconds
Right: Decrease the timeout period down to 5 seconds. Decreasing below 5 seconds turns timeout off.
Imp-Cal** Overview **
Menu item for selecting Impedance Setting/Level control action

** Navigate **
Enter: Selects Impedance Setting/Level Adjust control display
Up: Switch to Display menu item
Down: Switch to #Inputs menu item
Menu: Escape to default Volume Control Display
Impedance Setting/Level Adjust & Calibration Start** Overview **
There are 10 possible impedance settings. Setting #1 is enabled at the factory and is permanently set at 20k impedance, is the default setting/level, and the 20k level cann not be changed by the user. The user may enable 9 additional settings #2 through 10 with each setting having its own user adjustable impedance level. Each setting #/level must be enabled, configured, and run through the calibration process individually. When initially enabled or after making a change to an existing impedance level, that impedance setting # will be LOCKED and REQUIRE CAL. Those messages will be explicitly shown on the display. No other impedance setting may be accessed and edited until such time as the current enabled/edited impedance setting is either turned off or the preamp has been run through calibration at this new/edited impedance setting/level.

** Navigate **
Enter: Actions depend on the state of shown impedance setting/level as follows:
1) Level set to 0 (Off): Reverts to previously saved setting/level and returns to default Volume Control Display
2) Level set to 1-99 but has not been calibrated (setting Locked!): Starts calibration cycle at setting/level
3) Level set to 1-99 and has already been calibrated (Cal is OK): Setting/level selected and returns preamp to default Volume Control Display
Menu: Cancels impedance setting/level changes, reverts to previously saved setting/level and switches to Imped menu item.

** Select Impedance Setting **
Raise: Adjusts to next higher impedance setting number
Lower: Adjusts to next lower impedance setting number
Changing the impedance setting results in an immediate change depending on the state of the shown impedance setting/level as follows:
1) Level set to 0 (Off): No audio output since the impedance setting is turned off and there's no associated attenuation table
2) Level set to 1-99 but has not been calibrated (setting Locked!): essentially same as 1)
3) Level set to 1-99 and has already been calibrated (Cal is OK): Preamp switches immediately to attenuation table associated with impedance setting/level

** Adjust Impedance Level **
Right: Increases impedance level at current Impedance Setting # by +1k
Left: Decreases impedance level at current Impedance Setting # by -1k
The result of changing the impedance level depends on the state of the shown impedance setting/level as follows:
1) Level set to some new value: Audio output will shut off since there's no valild attenuation table associated with the new impedance level. Setting will become LOCKED and must either be set back to original level number, turned off (set to 0), or user must press Enter to run the new level through calibration.
2) Level reduced to 0: Audio will shut off and setting will be switch to Off.

** Start Calibration **
Mute: Starts calibration and switches to Calibration Control Mode
Calibration View/Stop** Overview **
Displays status/details of calibration process and allows user to stop the calibration process. During calibration each of the 4 LDRs is calibrated over 100 attenuation steps at the currently selected impedance setting/level. Once completed the preamp will exit the Calibration View/Stop display and revert to the default Volume Control Display.

** Navigate **
Enter: Stops the calibration process and returns preamp to default Volume Control Action display
Menu: Stops the calibration process and escapes back to Impedance Setting/Level Adjust display
#Inputs** Overview **
Menu item for selecting Number of Inputs control action

** Navigate **
Enter: Selects #Inputs Display
Up: Switch to Imped menu item
Down: Switch to Units menu item
Menu: Escape to default Volume Control Display
Number of Inputs** Overview **
Allows the user to change the total number of inputs the preamp can switch between. This value is initially set at the factory and is normally not changed. The maximum possible inputs is 6 and the minimum number of inputs is 1. If set to 1 input, the Input main menu item will no longer show up or be accessible and the single input #1 will be the only input selected.

** Navigate & Stop Calibration **
Enter: Returns preamp to default Volume Control Display
Menu: Switches back to #Inputs main menu item

** Adjust #Inputs **
Raise: Increase the number of total inputs by +1 (to max of 6)
Lower: Decrease the number of total inputs by -1 (to a min of 1)
Vol Units** Overview **
Menu item for selecting Volume Units control action (view volume as Steps or dB)

** Navigate **
Enter: Select Volume Units select control display
Up: Switch to #Inputs menu item
Down: Switch to Vol Max menu item
Menu: Escape to default Volume Control Display
Volume Units | Steps or dB** Overview **
User may opt to display volume in Steps 1-100 or in decibels between -60 dB and 0 dB in increments of 0.6 dB.

** Navigate **
Enter: Selects the current Volume Units (steps or dB) and returns preamp to default Volume Control Display
Menu: Switches back to Units main menu item

** Adjust Units **
Raise: Change display units to dB (-60 to 0 decibels)
Lower: Change display units to Steps (0-100 steps)
Vol Max** Overview **
Menu item for selecting Vol Max control action which sets the maximum volume step (1-100) allowed immediately after changing an input.

** Navigate **
Enter: Select the display units
Up: Switch to #Inputs menu item
Down: Switch to Vol Display menu item
Menu: Escape to default Volume Control Display
Vol Max adjust control** Overview **
Allows user to adjust the maximum initial volume setting immediately after changing the input. The purpose of this feature is to prevent the user from accidentally switching to an input which was previously set to a very high volume level when last selected.

** Navigate **
Enter: Returns preamp to default Volume Control Display
Menu: Switches back to Vol Max main menu item

** Adjust Units **
Raise: Increase max volume setting up to a maximum of 100
Lower: Decrease max volume setting to a minimum of 1
Vol Display ** Overview **
Menu item for selecting various display options to be used by the default Volume Control display.

** Navigate **
Enter: Select the display units
Up: Switch to Vol Max menu item
Down: Switch to Version menu item
Menu: Escape to default Volume Control Display
Vol Display control ** Overview **
Controls for selecting various display options to be used by the default Volume Control display.
Option #1 - Balance mode - Left/Right buttons adjust the channel balance
Option #2 - Input mode - Left/Right buttons change the input channel
Option #3 - Input/Phase mode - Right button changes the input channel. Left button toggles the Phase Reversal status of the preamp (only works with balanced preamps that are set up for phase).

** Navigate **
Enter: Accept currently selected Vol Display option and returns preamp to default Volume Control Display
Menu: Escape to default Vol Display menu item

** Adjust Display Option **
Raise: Scroll up to next option
Lower: Scroll down to next option
Version ** Overview **
Menu item for selecting Version Info control action

** Navigate **
Enter: Display version info
Up: Switch to Units menu item
Down: Switch to Reset menu item
Menu: Escape to default Volume Control Display
Version Info ** Overview **
Displays the product model name, controller hardware version, and controller firmware version. This is an "information only" control action. There are no specific controls associated with this control action.

** Navigate **
Enter: Returns preamp to default Volume Control Display
Menu: Switches back to Version main menu item

Reset** Overview **
Menu item for selecting Reset Control action

** Navigate **
Enter: Display Reset Control
Up: Switch to Version menu item
Down: Already at bottom of menu - display blinks
Menu: Escape to default Volume Control Display
Reset Control ** Overview *
Resets preamp to factory default settings which deletes all calibration data for all impedance settings including the default setting #1/20k. User must run calibration immediately after resetting the preamp. Once reset is initiated it can't be stopped and should not be interrupted. Users should only elect to reset the preamp controller in the event the controller's settings become corrupted or the controller becomes non-responsive.

** Navigate **
Enter: Returns preamp to default Volume Control Display and clears counter
Menu: Switches back to Reset main menu item and clears counter

** Initiate Reset **
Step 1: Press Right button 5 times until display shows the number 5
Step 2: Press Enter to start the reset process

** Running Calibration After Reset **
Once the reset process is completed, the user may have to put the preamp through at least 1 cycle of calibration since the reset process has erased all prior calibration data. Prior to version 213 of the firmware, the user must initiate this calibration cycle manually (see section on Cal above). Starting with firmware version 213, calibration is automatically initiated as the final step in the reset process.
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