<p>Thanks Casper.  I did what you suggested and didn't hear anything like you described.  I removed the two pots for the distortion amount and volume and checked them with a meter.  They were fine.  I used the schematic to find all components involved in the distortion unit and soldered all suspicious joints.  I retested the drone lab and whoa.   I don't know if "groaning feedback tone" really does it justice.  When the oscillators are turned down, the distortion volume is at full level and I slowly bring up the distortion amount, the drone lab makes some sounds that vary considerably depending on the settings of the other effects.  Thanks for the help.</p>
<p>Another question I have is about your video "Drone Lab demo 3".   The first 30 seconds has a great full sound.  Are you doing anything special or are you using the drone lab alone?   Also, I've noticed that the oscillators sound really distorted without the distortion effect if you set the pitches really low.  They loose that smooth, even tone they have at mid pitch.  What causes this?  Could this be modded by using a different chip for the oscillators?  I'm a big fan of low frequencies.  Thanks.
</p>
