instructions + review
this thing is best when following the guide for setting levels, which i've tweaked a bit below. as a bit of background, i use this mostly for guitar di, but also do vocals and moog synth thru it; all work well. so heres the setup:
1. Turn on pre-amp before mixer or anything else. Turn off after mixer is off.
2. Set gain so second yellow LED is warm 75% of the time, red doesn't necessarily mean clip, use yr ear
3. Set threshhold for compressor. Counterclockwise means more compression. Start with dial 100% wet and back it off slowly until you see yellow 0 threshhold light. Use ear and gain reduction meter to guide. For morst transparent results, adjust threshhold and slope to limit gain reduction to 9db or less.
4. Speed switch. FAST for signals that are repetitive, ie drum beats, vocals. SLOW for signals that vary in decay, or for mixing.
5. Optional: OPTO COMP switch OUT means compressor is BYPASSED and goes from tube to output. Use to set unity gain, achieved when sound ON and OFF is the same.
6. Set output level control. Guitar: Set at -3 and press INST. Button on back for sending signal to amplifier, or for general gain reduction to mix board.
7. Output level display shows yellow "O" when you have 12db or less of headroom before clipping. Level switch on rear shifts output without changing level display. INST setting for going OUT to another instrument in put, LINE setting for going to line in on mixing board (gives you more gain, better for recording).
8. For DI guitar setting, best results use line input in order to bypass mixer's onboard pre-amp. If youre going XLR out into your XLR in of your board, make sure INST mode is selected to lower gain/noise.
review: love this thing, and i hear replacing the tube works wonders, though the stock is just fine for me. its also worth noting that this is mono in ONLY. i was thinking i could do 1 XLR + 1 TRS sum to stereo but the front input (high Z) prevents that from happening, and your xlr is bypassed whenever its used. the compressor itself is great. this is cheaper than (most) stompbox compressors and gives you the added xlr input and makeup, so its a no brainer for the price. with a bit of gain and fiddling with the compressor, you can even wiggle fx out of this thing. recommended.