Behringer Model D Mods

During winter break 20/21 I finally found some time to update my oldest project and write an updated Model D Modifications Guide. Here we go:

https://maffez.com/wp-content/uploads/2021/01/BOOGMOD_ANNIVERSARY_GUIDE.pdf

The various modifications include reverting the VCO mixer section to original style, declicking the Loudness Contour and some things I covered in previous guides, such as VCO hard sync and pitch CV inputs per VCO. Here are some soudn clips and below the list of mods covered in the guide.

Paraphonic play
VCO Hard sync
VCO PHASE RESET ON KEY-ON (first without, then mod switched on)
PWM
MOD amount per CV instead of mod wheel
1uf timing cap instead of 10uf
declick (first second without, then with)
VCO MIX AS IS
VCO MIX REVERTED TO ORIGINAL MINIMOOG STYLE
Through hole mylar caps1
Through hole mylar caps 2 (NB resonance trimmer not yet adjusted)

– PITCH CV OUT
– GATE OUT
– NORMAL LC GATE IN TO FC GATE IN
– INDEPENDENT 1V/OCT CV IN PER VCO
– SWITCHING THE VCO MODULATION BUS INDEPENDENTLY FOR VCO 1 AND 2
– VCO HARDSYNC
– KEY-ON PHASE RESET FOR VCOS AND LFO
– EXTENDED PWM
– DIRECT WAFEFORM OUTPUTS
– DIRECT FILTER INPUT
– DIRECT LP FILTER OUTPUT
– LFO SPEED MODIFICATION
– KEYTRACKED LFO
– CONTROLLER SECTION (MOD BUS) AMOUNT PER CV CONTROL
– ALTERNATIVE NOISE INPUT NORMALLED TO MOD BUS
– SPEED SWITCH FOR FILTER CONTOUR
– VCA OVERDRIVE
– VCA DRONE SWITCH
– VCA CONTOUR DECLICK
“ATAVISTIC REGRESSION SET”
– BYPASS VCO MIXER OPAMP (IC16)
– BYPASSING THE MAIN OUT OPAMP (IC6)
– REPLACING THE FILTER POLE CAPACITORS