if you have also hum/buzz/crackle noises in your sound System, I found a very easy and cheap
solution to fix it.
I’m ownest: I looked a long while to solve the problem with the interferences.
The noises come, if you connect hardware synthesizer devices with a laptop/PC system and you
use the audio output through/from laptop/PC system.
I always thought, the noises are produced by the internal soundcard. So, I also tested
external “high end” soundcards…same problems.
Then I read/heard, that I have to sort my power supply units and so on and so on.
Nothing of the advices helped.
On the end I found finally, what the problem caused by:
It has to do with different electrical mass/electrical grounding PC/laptop <> synthesizer/connected hardware devices. This causes the noises.
AND…it is very easy and cheap to solve: I bought now a Behringer HD400 hum destroyer for around only
25$. Here you have 2 input and 2 output 6mm audio jacks…so stereo.
And then…problem completly solved! no noises/interferences furthermore.
I’m angry, that I found so late a solution
Before I had always switched/reconnected my audio stuff to my PA system in order to get rid of the noises.