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BOSS OC-2 synth mod with sound clips

Discussion in 'Effects [BG]' started by gastric, Oct 3, 2011.


  1. avvie

    avvie

    Oct 12, 2010
    Maui, HI
    Outside of a gate, not entirely. A lot of it gets lessened by turning the bass down on the tone control....not the effect bassists want ;)
     
  2. gastric

    gastric Professional product tester for hire

    Jun 8, 2009
    Raleigh, NC
    Source Audio BETA tester
    Turn the VOLUME down on the instrument, that effectively gates the synth-mod tone. But as previous stated it negatively affects the dry and non-synthmod sounds.

    The synth mod basically solos the raw oscillator. So it's a hard on/off sound, no dynamics, no real control over output volume via playing, just a note tracking on/off control over the oscillator sound.

    But it's badass!!! Well, at least different. :) You can get all sorts of interesting sounds blending synth-mod OCT2 with normal or synth-mod OCT1.

    Sound clips towards the very end of this page: http://cgraham.com/chris/music/sound_clips.htm
     
  3. kevteop

    kevteop

    Feb 12, 2008
    York, UK
    So, just to be clear: After adding this trim pot, the pedal doesn't make noise between notes any more, and you still get that awesome square wave sound?

    If this is the case I am very interested in seeing your instructions!
     
  4. Skrogh

    Skrogh

    Jan 28, 2010
    Denmark
    I still would like mine to gate harder - that's why I began designing an external gating circuit, but couldn't fit inside the OC-2. It stays quiet between notes, but there is some fizz on note attack and release i'd like to get rid off.
    Hehe I'd love to build one for you John, I'm a big fan of the stuff you play with Nerve, but I guess it isn't that practical, me being from Europe.

    (Off topic, do you have any plans to gig in Northern Europe any time soon?)
     
  5. Skrogh

    Skrogh

    Jan 28, 2010
    Denmark
    Got a brilliant idea while working on that math assignment! Fixed the negative envelope follower to just below bias voltage. This effectively gates the synth signal about as hard as a woolly mammoth :D Only problem is that it gates harder the higher you play (note/tone and there is a limit to how open the gate can be. (these things are quite easy to solve, there just isn't space enough in the OC-2)

    I'm writing a schematic at the moment, but don't know if I will finish it today.

    EDIT1: Oh yeah and there is also an easy mod to solo OCT-1 and more than double the volume!

    EDIT2: Sound clips:

     
    Last edited by a moderator: Apr 16, 2014
  6. Skrogh

    Skrogh

    Jan 28, 2010
    Denmark
    Sorry for triple posting, but thought a bump with schematics was fitting:
    oldschem.
    Original from:Boss OC-2 Dual Octave Down Guitar Pedal Schematic Diagram

    Synth%2520mod.
    There are two mods here, my "bleed less"-synthmod and my "hard gate"-mod.

    Explanation:
    --Break connection between the red wires.
    --Connect (1,1) in the first schematic to 1-1 in the second schematic. (1,2) to 1-2; (2,1) to 2-1 and (2,2) to 2-2
    --Both switches are shown in "stock position".
    --Vb is the bias-voltage, available between R45 and R25.
    --This symbol: _|_ means "ground", connect it to the casing, or anywhere with the similar symbol in the b/w schematic.

    How it works:
    -Bleed less
    --The problem with bleeding occurred (to some), because a wire with a very hot signal, with lots of overtones, was passing physically close to the clean octave.
    --This mod uses the phase inverter. Instead of "flipping" (phase-inverting) the clean signal around the bias voltage, a fixed voltage is flipped - thus a squarewave is outputted.
    --The OCT-1 squarewave is routed through the filter, this would need bypass, if one wants extra face-melting sounds.
    --The OCT-2 automatically becomes "synthed", but not with a squarewave.
    -Hard gate
    --Each peak of the incoming signal is compared to a threshold. If the limit isn't reached, no sound leaves the box.
    --The OC-2 tracks pitch on the rising peak. The gater on the falling. This makes it possible to gate instantly.
    --There is one drawback: I had to make a little workaround, so unfortunately it gates a bit harder on higher pitches.

    Unfortunately I did not take any pictures during the assembly. so can't make a good pic-torial about how to perform the mod.

    Any questions are welcome.
    Happy modding!:hyper:

    EDIT: (Clips in a decent quality will be recorded this weekend.)
     
  7. kevteop

    kevteop

    Feb 12, 2008
    York, UK
    Great work man, looking forward to hearing the clips. :)
     
  8. Skrogh

    Skrogh

    Jan 28, 2010
    Denmark
    Tadaa:

    Recorded this weekend at my drummers place.

    Disregard sloppy playing.
     
    Last edited by a moderator: Apr 16, 2014
    Unchain likes this.
  9. That last part sounds awesome. Digging what you are doing Skrogh.
     
  10. Hyper-sloth

    Hyper-sloth Supporting Member

    Apr 3, 2008
    Tampa, FL
    Cool. I have one and I really dig the added versatility. Thanks for the clips
     
    Last edited by a moderator: Apr 16, 2014
  11. Basehead

    Basehead Now with even more synthy goodness...

    Jan 3, 2008
    New York NY
    Ooof! This sounds NASTY (in a good way)...

    I want!
     
  12. Skrogh

    Skrogh

    Jan 28, 2010
    Denmark
    Thanks guys :bassist:
    Uploaded some more noodeling. This time with a secret weapon on the modulation ;)
     
    Last edited by a moderator: Apr 16, 2014
  13. gastric

    gastric Professional product tester for hire

    Jun 8, 2009
    Raleigh, NC
    Source Audio BETA tester
  14. amos

    amos

    Oct 23, 2003
    SE Portland Oregon
    So is it recommended to buy a second oc-2 for this? (whether it's already been modded or not)

    Also do we know if it's possible to mod the pedal so the direct level feeds oct-2? I'd love to be able to use oct-1 factory and oct-1 synth at the same time using just one pedal. I need to take a look at the schematic, but if anyone has any info about this please share!
     
  15. gastric

    gastric Professional product tester for hire

    Jun 8, 2009
    Raleigh, NC
    Source Audio BETA tester
    The modded OC-2 is still a factory OC-2. Just flip a switch, solo OCT-1, and it's just like it always was.
     
  16. amos

    amos

    Oct 23, 2003
    SE Portland Oregon
    Cool. I wish I wasn't so broke at the moment, I would snatch up your modded oc-2 :)
     
  17. amos

    amos

    Oct 23, 2003
    SE Portland Oregon
    HEY GUYS. I really like my OC-2. I don't really feel I need the synth mod. What I wish I could change however is the volume envelope. I like the natural sustain of my bass, so I can control the ADSR with my hands. Is there a way to keep the tone of of the OC-2 but get rid of the volume envelope circuit, if only just for oct-1? If anyone has done this, or thinks they could do this, please let me know!
     
  18. gastric

    gastric Professional product tester for hire

    Jun 8, 2009
    Raleigh, NC
    Source Audio BETA tester
    Experiment with a compressor in front of or behind the OC-2 to solve that issue. Note you can also change the tone of the OC-2 by overdriving it's front end. Slam it with a huge DB boost in front to push it towards a fuzzier tone. I have some sound clips on my general clips page of the OC-2 being slammed in that way.
     
  19. NoiseNinja

    NoiseNinja Experimental-psychedelic-ambient-noise-drone Banned

    Feb 23, 2011
    Denmark
    my woolly mammoth dosn't sound like that :D

    Unfortunately I don't own a OC-2, never the less a really cool mod.
     
  20. JonnyAngle

    JonnyAngle Dropping Acid Pedal Etching .com Supporting Member Commercial User

    Nov 24, 2008
    Maple Grove, MN
    DroppingAcidPedalEtching.com
    I did the synth mod (via instructions from YouTube) on my OC2 (Taiwan) and have a few questions:

    When the synth mod is bypassed (normal mode), there is a slight "synth mod sound" that is very quiet in the background. W T F is happening here?

    When is synth mode, there is some octave jumping... If I let a note ring it can go up and down an octave (even with only one octave engaged). Any tips?

    I play a Stingray or a EBMM Sterling, so both basses are pretty hot.

    To come clean, I didn't read the whole tread cover to cover. THANKS!
     

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