Datasheet

PedalSync™

Tru-Foot

LFO chip MV-55(B)

Datasheet - p.5

PedalSync_MV-55_MV-55B_Tru-Foot_LFO_Datasheet.doc DRAFT v9.1

Duty Cycle

(pin 5, pot3)

The Duty Cycle pot adjusts the relative playback speed of the first and second half of the

waveform to make the output swing. The thirteen (13) duty cycle ratios correspond to the most

common musical subdivisions: 1/20; 1/8; 1/6; 1/4; 1/3; 3/8; 1/2; 5/8; 2/3; 3/4; 5/6; 7/8; 19/20.

The Duty Cycle pot can transform the Triangle wave into a sawtooth up or down.

MV-55 & MV-55B Differences

MV-55 and MV55B are identical except that MV-55 loads Program 1 automatically upon startup,

whereas MV-55B reads the four input pots, Clock or Pot/Tap mode switch, and Waveform Select

switch on startup and sets the output accordingly. MV-55B ignores the Speed pot if the chip is in

Clock mode at startup.

User Interface

Program Storage

The Tru-Foot

™

LFO chip stores 128 programs. Programs are stored by toggling the Write

Switch (pin 16) or upon a command from the PedalSync Master Control chip MV-58(B). When

using the Write Switch, the program is written to the currently-selected program number.

Program Recall

Programs are recalled using the PedalSync Master Control chip MV-58(B), standard MIDI

Program Change messages on Channel 15, or the PedalSync 4 Presets chip (MV-59).

On power up, the MV-55 chip always loads program 1, MV-55B does not.

Write switch

(pin 16)

It is possible to use a momentary pushbutton for the Write switch, however a toggle switch is

recommended to make it difficult for users to accidentally program a setting.

Using a toggle switch, the user will close the switch, then open it again to write the current

settings to the currently selected program. If the switch is in the closed position, the user will

need to open, close, then open again.