Minibrute CV out to Old School
Posted: Fri Jan 11, 2013 3:31 pm
Anyone who owns both tried this?
Moog Music Forum
Share Ideas and Pass the word
https://forum.moogmusic.com/
Minibrute CV out to Old School
Page 1 of 1
Re: Minibrute CV out to Old School
Posted: Fri Jan 11, 2013 8:02 pm
hmmm- well, I guess I'll experiment and post back, if anyone's interested! maybe I should wait until the "subphatty" talk dies down?
Re: Minibrute CV out to Old School
Posted: Sat Jan 12, 2013 12:26 am
Not that specifically, but I've played other (like MP201 into VOS) and various sequencers (q119, Random Looping Turing, STG).
The trick is, as you likely have read here that yours may not be calibrated to 1V/oct. and R47 which is 100k (I recall) is to blame. I paid Moog to pull mine and place a 90k resistor in series with a 20k pot (again, let me verify the values for you), then it was adjusted to be precisely 1V/oct.
Considering your Brute is only 2 Octaves, you may get by just fine by attenuating the voltage just a tad. Try it directly wired, then put a 20k pot inline, first on a voltmeter then when it looks close to the mystical .97 give it a listen. May track well enough.
Keep in mind that your Minibrute MIGHT output higher order voltage if 'set' to the upper keyboard range, or this may just affect midi-out or OSC footage. In general, voltages are combined such that the position of the OSC footage on your VOS is added to the incoming Pitch CV which is added to the last key pressed on VOS. So by offsetting appropriately, you may be best served keeping MB at the lowest point (unless you plan on doubling). Either way, experiment and see what works. Ear + Voltmeter + voltage divider are the piece parts required to get it working and if you are feeling adventurous, you can attack R47. If I was going at it today, I would do it myself but at the time, I was a) terrified and b) didn't have good DIY skills; alot has changed in the past 3 yrs.
The trick is, as you likely have read here that yours may not be calibrated to 1V/oct. and R47 which is 100k (I recall) is to blame. I paid Moog to pull mine and place a 90k resistor in series with a 20k pot (again, let me verify the values for you), then it was adjusted to be precisely 1V/oct.
Considering your Brute is only 2 Octaves, you may get by just fine by attenuating the voltage just a tad. Try it directly wired, then put a 20k pot inline, first on a voltmeter then when it looks close to the mystical .97 give it a listen. May track well enough.
Keep in mind that your Minibrute MIGHT output higher order voltage if 'set' to the upper keyboard range, or this may just affect midi-out or OSC footage. In general, voltages are combined such that the position of the OSC footage on your VOS is added to the incoming Pitch CV which is added to the last key pressed on VOS. So by offsetting appropriately, you may be best served keeping MB at the lowest point (unless you plan on doubling). Either way, experiment and see what works. Ear + Voltmeter + voltage divider are the piece parts required to get it working and if you are feeling adventurous, you can attack R47. If I was going at it today, I would do it myself but at the time, I was a) terrified and b) didn't have good DIY skills; alot has changed in the past 3 yrs.
Re: Minibrute CV out to Old School
Posted: Sat Jan 12, 2013 1:48 am
No slam, but that 20K pot was meant for a mod where a 100K resistor became 90K.
On an unmodded CV input, one can only decrease a CV using an inline pot, so a 10K is more appropriate and may be easier to find.
The idea of the 90K in place of the 100K was that one could adjust 10K in either direction.
On an unmodded CV input, one can only decrease a CV using an inline pot, so a 10K is more appropriate and may be easier to find.
The idea of the 90K in place of the 100K was that one could adjust 10K in either direction.
Re: Minibrute CV out to Old School
Posted: Sat Jan 12, 2013 10:38 am
Not a problem. As I said, I'll verify the values and update this post so that it's here for others (this question is very often asked/debated)
Re: Minibrute CV out to Old School
Posted: Sat Jan 12, 2013 10:45 am
thanks fellas!
Re: Minibrute CV out to Old School
Posted: Sat Jan 12, 2013 11:16 am
I have both, but have not attempted this. I don't have a good understanding of control voltages and I'm terrified I'll fry something if I try anything like that.
Re: Minibrute CV out to Old School
Posted: Tue Jan 15, 2013 9:37 am
I doubt you would be able to fry anything with +/- 5-10 volts.Kenneth wrote:I have both, but have not attempted this. I don't have a good understanding of control voltages and I'm terrified I'll fry something if I try anything like that.
