First I'd like to say hi.  This site seems like it is a wealth of info.  Thanks in advance.  Now down to the nitty gritty, I have a Moog Lab Series L7 (309A) and I need some help.  For those unfamiliar it has 2 channels.  The 1st is a clean channel, the 2nd offers clean, reverb, frequency and midrange.  The 1st channel is working great, the 2nd channel is not working.  All I can get from the 2nd channel is the sound of the frequncy adjuster.  I plug in the guitar and nothing.  The only way I get any sound from the second channel is when I turn the volume knob past 5 and the midrange is set to 0, it is at this point that I can hear the sound of the frequency pitch which changes pitch as I turn the frequency knob.  I found a bad solder joint on the input of the 2nd channel and fixed it but still no go.  Just so you know it makes this noise with or without the guitar plugged in.  Any ideas?

Thanks in advance,
-Dave