Arturia Forums
Hardware Instruments => MicroBrute => Topic started by: bca on March 16, 2020, 07:27:43 pm
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I'm repeating my post (https://www.gearslutz.com/board/electronic-music-instruments-and-electronic-music-production/1302118-microbrute-sub-oscillator-issue.html (https://www.gearslutz.com/board/electronic-music-instruments-and-electronic-music-production/1302118-microbrute-sub-oscillator-issue.html)) here, as it seems this is the most likely place to get help. Other MB users seem to confirm that I do have some 5th component in my sub oscillator even with the Sub>5th knob turned all the way down.
Check out my audio comparison of my regular square wave vs the sub osc here: https://soundcloud.com/droveloder/microbrute-square-vs-sub-oscwav (https://soundcloud.com/droveloder/microbrute-square-vs-sub-oscwav). (note the track thumbnail shows the sub's waveform I recorded).
Can anyone confirm if adjusting trim pot "T7" (saw amplitude) will do the trick?
I'd guess that if the knob could turn another 1/2 step counter-clockwise, all 5th harmonics would be eliminated (which is what I need for sub-bass patches)
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Problem solved. It just required a slight adjustment of trim pot "T7".
If anyone else needs to perform this adjustment, here's how:
-setup a basic patch with the filter open, the sub oscillator level at max and the 5th turned all the way down.
-flip the MB upside down
-remove all the screws on the bottom cover
-tilt the cover/keyboard assembly up out of the way but keep the ribbon cable connected
-Locate trim pot T7 (if the unit is upside down, it will be a sunken-in screw on the mid-left area of the circuit board, labelled "T7")
-get a tiny slot or phillips screwdriver that will fit it.
-plug in the unit, attach headphones
-hold down a note on the keyboard and turn T7 until you hear the overtones disappear.