Hello again, people:
After months of intense use and testing, I give some additional tips for the classic chassis version of the OM.
I’ve found out that “sub octave” works better with guitar and vocals (as they have enough mid-high requency range to get some useful sub octaves), while it’s more useful keeping it disengaged for bass.
I tested it with keys (a friend of mine played while i was tweaking the knons) and it’s more flexible, depending the octave range you play, you may choose sub or not.
I checked it with bass and noticed that keeping the sub-octave on caused lots of gain peaks (the limiter LED lights almost everytime), but some of the sub octave gets lost as some frequencies may be out of the audible range (depending what notes you play, they may be near of the low freq. spectrum), so I noticed a certain volume “drop”. But there’s a rumble caused by the sub-harmonics. So I disengaged the bass filter and it works much better for a subtle effect, unless you want a thick sound (in this case, with the sub-octave on, it needs additional help -> read tips below).
This is a good setting for guitar:
High filter - MAX.
Blend - 9 or 10 (Distortion before)/2 or 3 (Distortion after).
Bass filter - MAX.
Sub - ON.
NOTE: You may get better results placing a BIG MUFF before or after, depending the amount of octave you want to put into the mix. If you want more octave, push up the distortion output.
Using it with vocals: Roll the blend knob past 50%, so you can get more “Jabba-The-Hut” tones.
This is another setting for bass:
High filter - 10.
Blend - 9:30 o’clock.
Bass filter - Disengaged/3.
Sub - OFF/ON.
If you want your 4-string bass sound like a 5-string, use the sub octave and an EH Q-Tron placed after the OM with this setting:
Drive: DOWN.
Boost: ON.
Gain: More than bypass.
Peak: Just a little bit.
Mode: LP.
Range: LO
NOTE: A Black Russian BIG MUFF or Bass Big Muff with low-gain placed after the OM gives an extra punch.
These are my OM’s:
From left to right: 1975 OM, Early 2000’s RI, Late RI (2006). I use the first two with guitar and the Late RI with bass.
If you want a 70’s organic octave down sound… go for the OM.
If you want to go further, try the Micro Synthesizer or the POG series.
Regards.
S.W.