Rawit wrote on Yesterday, 08:04:

The Wavetable Pi is also noisy in my experience. Had those "computer thinking" noises. Tried some fixes from the GIT repository but no cigar.

I assembled my own WavetablePi boards in a similar manner to this, just that I additionally moved the caps to the other side as well, leaving only resistors whose height is negligible on the side of wavetable connector, eliminating any possibility of conflict with components on sound cards.

The resulted board would be much thicker that will occupy the adjacent slot, but it's not an issue for ISA sound cards plugged into dISAppointment.

I'm not sure about the possible causes of the noises regarding WavetablePi... perhaps my ears are not sharp enough to be aware of any. It's possible this different way of assembling the board might have resulted in a different, less noisy atmosphere.

NeoG_ wrote on Today, 00:30:

Makes me glad I paid the extra for a WP32 😬

WP32 is amazing good in terms of output clarity, yes.

Linoleum wrote on Yesterday, 23:49:

Especially when you have an i2c oled screen installed I found...

Removing that was the first thing I tried. But then I noticed that the noise was different using the SF2 mode vs the MT-32 mode so it was coming from the Pi.

Rawit wrote on Yesterday, 08:04:

The Wavetable Pi is also noisy in my experience. Had those "computer thinking" noises. Tried some fixes from the GIT repository but no cigar.

Could moving the wavetable card away using a flat cable help?

Nitram78 wrote on Today, 10:11:

Rawit wrote on Yesterday, 08:04:

The Wavetable Pi is also noisy in my experience. Had those "computer thinking" noises. Tried some fixes from the GIT repository but no cigar.

Could moving the wavetable card away using a flat cable help?

I doubt it, this sounds like an issue with filtering and shielding on the audio channels. Someone like @dreamblaster @LABS or @keropi would probably explain better.

The way I ended up taming the noise was by doing two things:
A) bumping up the gain in the config file, and
B) lowering the MIDI output level in the card’s mixer.
With that combo, the noise floor is no worse than what you’d get from a typical Sound Blaster.