Thomas Henry MPS number 2 finished first with mfos dual A/R generator.
I wanted a couple of A/R generators with repeat function and a couple of simple LFO's (lfo's to be fitted on MPS number 1 module, under construction).
These will be used to modulate the mps , cynare , mfos VC echo, mfos VC pan & battery acid CV , when required.
Slowly getting near the end .
Dave.
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And also got the Quad-BASS++ finished too after a battle with finding a little slither of copper between tracks on my veroboard daughter board for the pitch bump & wave mods , got it though and working now .
That's all the sound making panels loosly fitted in place in the case, now the long list of snagging jobs to do (wrong direction pots , couple of volume level increases & wire the FX send rotary switches to the modules that don't have an audio output jack on their panels.
Dave.
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may i ask whether you considered a central bus system for the gate/trigger/cv inputs and if yes, what made you go completely modular?
Hi , I did think about bussing the triggers & audio, but when I received the engineers at work midi to 24trig converter, I ended up just running the trigger cables direct to the screw clamp terminals on the converter .
The drum system is run from the heart of my studio... RM1X midi sequencer , I included a few trigger inputs on some modules, when an external trigger is plugged in , it breaks the midi trigger with the switch jacks .
On the nein oh nein modules , the accent inputs are great for adding a bit of velocity changing cv's.
The previous drum synth I built in 2009 had a single panel with 8 voices , it was a pain when wanting to mod something later on having to take the whole panel off .
This 12 panel system (18 voice) will be easier to remove stuff for maintenance or modding.
By studying these pages and the 808 service manual I was able to cross reference between them to help me lower the tuning of the kick and extend the decay a little on the snare & cymbal.
2X CYNARE :- as the original CGS47 cynare with the 6 shimmer control pots brought out to the panel.
Pan Control :- all the modules have their own volume out controls, the outputs from each module are wired in screened cable to this panel's veroboad circuits , nearly all the voices were reasonably balance in level , only a couple of drum sounds needed a little pre amp to boost.
FX and mixer :- Hexinverter battery acid CV , compressor & MXR distortion built as per document & pcb , stand alone FX
,Drum voices or external sounds / instruments can be pluged into it.
Mfos cv panner speaker simulator , the outputs are hard wired to the stereo bus , input level is set with a trimmer on the pcb it is set for the drum modules levels only.
2x Mfos CV echo , built as per design & pcb , these are both stand alone FX (in & out jacks).
The two rotary switches are FX sends for the modules that don't have an audio output socket on their panels , rotary 1 handles Bass++ 1,2,3 & 4.
Rotary 2 handles Cynare 1&2, MPS 1&2 , both selectors send their signals through a unity gain buffer to the single socket under their dials ready to patch to FX .
The little 5 channel pan mixer above those acts as FX returns to the stereo bus or plug an external instrument in if needed or the returns from an external FX unit .
That's my brain empty of drum info now , I'm off to programme some demo patterns
may i ask whether you considered a central bus system for the gate/trigger/cv inputs and if yes, what made you go completely modular?
Hi , I did think about bussing the triggers & audio, but when I received the engineers at work midi to 24trig converter, I ended up just running the trigger cables direct to the screw clamp terminals on the converter .
The drum system is run from the heart of my studio... RM1X midi sequencer , I included a few trigger inputs on some modules, when an external trigger is plugged in , it breaks the midi trigger with the switch jacks .
On the nein oh nein modules , the accent inputs are great for adding a bit of velocity changing cv's.
The previous drum synth I built in 2009 had a single panel with 8 voices , it was a pain when wanting to mod something later on having to take the whole panel off .
This 12 panel system (18 voice) will be easier to remove stuff for maintenance or modding.
Dave.
thank you for the explanation. i totally missed this post as well as page one of the thread. with the midi > trigger converter it makes perfect sense, thought you were using the front panel jacks only...
very cool demos. i like the sound of your 808, the low-pitched cowbell sounds nice. did you install a switch for the timing caps or is it fixed?
Hi
The cowbell had 2 trimmers showen on the circuit to tune the cowbell (& cymbal & hats) I changed those for panel pots for some adjustable tuning , also the hi-hats both have the white noise from the snare available with a 2 way switch to select the original 6 square osc's or the white noise.
the 808 kick & snare panel was a bit empty when designing the stickers, I put the trigger sockets in to fill it up a bit .
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