I experienced an unexpected sound modulation during a jam session yesterday, seemingly coming from track 3 on my Analog Four (and only track 3), despite having set the first filter of T3 to the lowest frequency. It resembled a (synchronized) LFO modulating the cutoff. I checked and then deactivated both LFOs, removed envelope modulation, and verified the performance knobs were set to 0, but the sound persisted.
Setup Context
- Sequencing the A4 with the Oxi, which also sends out the clock.
- Audio from A4 routes to Octatrack and MIDI goes to Analog Rytm before reaching the Octa.
Debugging Findings
- Starting the sequence from the Oxi triggers the modulation on track 3’s filter.
- Rebooting the A4 and playing a sequence internally eliminates the modulation.
- Restarting from the Oxi then stopping, and playing something internally on the A4 without rebooting brings back the modulation.
After rebooting all devices today, the modulation issue disappeared without changing any kits or patterns on any of the machines, including the Oxi, leaving me puzzled.
Seeking Advice
Although the issue has resolved itself for now, I’d appreciate any insights on what might have caused it, especially to prevent potential problems during a live performance. Does anyone have suggestions on where to start looking should this occur again?
Thank you almighty oracle.