ACO160EVK
Audio‐to‐Synth Evaluation System
3
999 SW 1
st
Ave. #1617, Miami, FL 33130
ACO160EVK Controls
Name
Type
Description
Preamp Gain
Knob
Adjusts preamp gain from 0‐50dB.
HPF
Switch
High‐pass filter corner frequency set to 16/80/160Hz.
LPF
Switch
Low‐pass filter corner frequency set to 300/1.2k/5kHz.
Gate
Threshold
Knob
Tunes gate threshold from 0v to 3.3v.
Env Rate
Select
8‐Pos
Rotary
Switch
Adjusts the envelope decay rate to accommodate various instruments.
Use fast rate (CCW) with fast‐decaying sources like bass guitar and
slower rate (CW) for sources with complex harmonic profile like violin.
Wave
Switch
Selects square/saw/sine wave for processing by VCA.
Pitch Freeze
Switch
By default, connects gate out to FTRACK input to enable frequency
tracking. Can be momentarily held in opposing position to disable
frequency tracking and freeze the current pitch.
Harmony
Knob
Offsets harmony shift to accommodate various CV ranges.
Aux Mix
Knob
Mixes VCA output with auxiliary audio input from Aux In
Output Level
Knob
Output master volume
Sync Freq
Knob
Adjusts hard sync oscillator generated by uC over 10‐10kHz range.
Setting knob fully CCW turns off the sync oscillator. Note that the sync
oscillator is only active if the upper ACO Mode switch is to the RIGHT
ACO Mode
(S1)
Dual Switch Left/Left (upper/lower): Default mode, MIDI, audio both active
Right/Left:
MIDI off, hard sync oscillator active
Left/Right:
MIDI on, ACO audio output disabled
Right/Right:
Test mode only
Bend/Cal
Mode
Switch
Sets MIDI pitch bend mode: Left = Quantize MIDI notes to 12‐note
equal‐tempered scale; Middle = Pitch bend over +/‐1 quartertone only;
Right = Pitch bend over full +/‐2 semitones. If CAL button is held down,
generate calibration tones as follows: Left = 100Hz; Middle =
alternating 100/800Hz; Right = 800Hz
Cal
Button
Hold button down to generate calibration tones as described above in
description of Bend/Cal Mode switch. When button is released
frequency‐to‐MIDI non‐linearity correction calibration is performed.
NOTE: Preamp gain and gate threshold knobs must both be turned
fully OFF (CCW) for calibration to work correctly!
Also note that this calibration was performed before shipping and is
not necessary to repeat. Description is provided for informational
purposes only.
Reset
Button
Global reset for micro‐controller and ACO160 chip
