Also check that your synths are fed into the right inputs....eg I have mine running into LINE LEVEL inputs (@ -10dB or +4dB depending on your gear)......and NOT running into mic input (Although I dont know for sure if this is the cause, but am trying to rule out everything)
Basically, you need to start from scratch, with nothing going into the mixer except your headphones (not even your monitors). Then add your synth and see if noise is still there. If not, then record into soundcard...and on playback see if the noise is there. ALSO, try to keep audio leads and Power leads away from each other, and if they do have to cross, make sure they cross at a 90 degree angle (right angle), otherwise you will induce a current electromagnetically into the audio lead. Also make sure your power leads arent wound around on the floor as this creates a large magnetic field. Best to have them straight.
Also try recording into different channels, and different input on your sound card. Dont give up and just live with the problem...get it sorted now, otherwise you may be needlessly buying new equipment when the stuff you have is fine.
Good luck,
Jase
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