Comments (3)
The three action buttons are sharing signal with their respective cv inputs
A0
retriggerA1
is play/pauseA3
roll
from tri-plus-ger.
Using a multimeter and some long metal wire to probe, I believe that the tempo CV goes through
- what I think is a schottky diode for circuit protection to ground
- a 10k resistor mounted in the center of the jack's leads
- a normal diode going forward on the south side of the jack
- pin 9 (ltr wrapping) of the right-side 2x5 header between boards 1-2
- pin 2 of the right-side header between board 2-3
- the normal/host side of the lowest configuration pin which shunts to the center pin
- pin 1 of the right-side header between board 2-3
- pin 3 non-inverted input (2nd down on slanted side) of a 072AC Texas Instruments dual op-amp on board 2
- pin 1 output from op-amp (1st down on slanted side)
- another diode just north of the op-amp
- pin 15 of the CD4051BM multiplexer that's on the top left of board 2
which would be channel 2 .. which has already been identified as the tempo knob ... which means that perhaps the tempo cv and knob are added together?
from tri-plus-ger.
Confirmed with a scope yesterday that tempo CV and tempo knob are combined on a single pin. the knob raises the floor value. the maximum voltage of both is what's on multiplexer channel 2
from tri-plus-ger.
Related Issues (20)
- Unit Test Some Things HOT 1
- Optimize Grid reads/writes for EEPROM/RAM
- Arduino inputs are 10-bit
- Don't skip beats
- maintain internal clock when no external clock is used HOT 2
- maintain retrigger behavior (beats start immediately instead of waiting for internal beat)
- keep time with external guidance but match retrigger start point
- Use the tempo CV/Knob as Clock+Slip Input
- tap tempo HOT 2
- set weight tolerance defaults HOT 1
- Quantize vs Loop Length HOT 2
- Multi-function "sticky" knob states + instant feedback
- Play/Pause
- Mutes
- Investigate Multi-function transport controls
- Better weight LEDs
- Restructure memory for quantization
- Unit Test Quantization
- Support AVR ISP Mk II in Platform IO
- Autosave
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from tri-plus-ger.