As I understand it, the DAC of the shruthi’s osc is one bit and requires highpass filtering to remove DC offset, right?
I think this highpass filter is set a bit too low to do the job properly, at least on my 4PM board.
The results are short, exponential dc-pops on the attack and release phase of each note.
I think it also makes the ~1kHz control rate of the VCA env audible in some cases, for example in the release phase of
lowpass filtered sounds with low cutoff.
So I want to raise the DC filter cutoff and maybe lower the VCA CV lowpass cutoff a bit.
Has anyone done this or knows how it’s done?
For the DC filter cutoff, it looks like C28, C6 or C2 could be responsible.
For smoothing the VCA control signal, C5 looks suspicious to me.