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I have a problem with noise/hum when plugging a midi cable into the midi in of the sh1oh1. My set up is simple — I am just using the sh1oh1 as slave when clock syncing to external sequencer. The noise is present whenever the midi cable is plugged into the sh101 and stops when it is removed. I’ve tried replacing the s101 with another synth to see if the problem is from my other device but all other synths I’ve tried give a crystal clear signal when connected.
This is off for the simple reason that midi is not ground coupled. So there should be no additional noise via a ground loop.
Is the noise just there if you plug it in, or only if you also send midi? Does it go a away if you stop sending midi clock and notes?Maybe the internal MIDI cable is near a critical audio path ?
This might be a power supply issue. You might want to check your electrolytic caps.
Following this. I have this exact issue as well. The noise is at manageable levels but a fix would be great.
https://soundcloud.com/ubx127/sh101-mid … se/s-nOgQu
Did a brief recording of noise levels. It’s very faint but noticeable with headphones.
One interesting thing is that my MPC has 4 MIDI outs (3 of which are connected to the midi patchbay where the SH101 is connected), if I activate clock over several MIDI outs from the MPC the noise from the 101 increases. Might be a valuable hint for someone more technical than myself.
(Seems like comments are not visible on private SC links, MIDI clock is turned on about 4 seconds in)
jpmct wrote: ↑
Fri Feb 14, 2020 2:38 pm
“Maybe the internal MIDI cable is near a critical audio path ?” — would it be possible fix this with little electronics experience?
Yeah just move the internal cables position and at the same time check if the sound change depending on where they are.
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