MIDI controller Whistling, NEED HELP!

Other Hardware Audio
1

Hi,

I've just wired my first midi controller based on "nano". I am using it for control sound device (lexicon mx300).
I am a guitarist and "noise question" is very important for me. So when I plug cable into my controller I hear whistle from my amp. It happens even when I don't connect midi cable to my sound device. Whistle begins when I plug cable into my controller only, looks like cable works like antenna.

Any suggestions?

Thanks!

2

Teach it some words?
(why does hummingbird hum? it doesn't know the words)

Check your grounding - a lot of audio poor perforamance starts with ground issues.

3

I've checked the ground, even run controller using battery. 5 last venues were with noise...

4

Whistle begins when I plug cable into my controller only, looks like cable works like antenna.

Yes it does.

I've just wired my first midi controller based on "nano".

So what schematic have you used? It is hard to give an answer if we don't know what you have and how you have made it.