I'm looking for advises on how I could reduce crackling and noise when recording from line output to line input (big jack stereo wires).
Actually I output the sound from a keyboard synthesizer to the line input of my sound card.
With a small mix table in the middle to monitor the levels and output the master signal to a speaker.
The wires are quite long and I can hear noise from the FM (or maybe AM) when recording.
I try avoiding recording at maximum output vol. to avoid saturation.
So I record just below the limit of saturation but the resulting sound recorded is quite low and any attempt to increase the volume shows up the noise and crackling.
Could you advise me on how to reduce this effect, or point me to relevant information source on how to properly perform a sound record ?