Controllers and Editors for Synths, Keyboards and Effects

Eurorack version designed for Behringer 2-XM (Works with any MIDI equipped synth with 0-10V CV inputs)          Envelope - ADSR plots There are no Digital to Analogue   Converters -DACs  used in this design. The only additional components on the FVCs are op-amps to boost the 5v output to 10V. The ProMicro supports analogue output using PWM. If this happens at a very high frequency the output is very smooth. The output is filtered with a simple RC filter and there is no digital noise picked up by the synth. The Attack is 0-10s with Decay and Release up to 15s. The envelope is exponential. Here are some plots from various ADSR settings:           Basic Version - No CV Control  FVC-1         Four Voice Controller with Keyboard Logic and Faux Vibrato       All functions are controlled with CC numbers  so you need a controller keyboard     Polyphonic control of 4 MIDI chann...

The Pro Micro  How to get the projects If you are interested in building any of these projects please contact me for details. I don't supply any parts but you can get the Pro Micro and other parts from eBay etc.  You can contact me via the comments sections. Alternatively,  email me at  gmail - my name is chaz riff but without the space ;) Behringer 2-XM Polyphonic Controller This is the latest project - a four voice controller for the Behringer 2-XM. This is based on the Oberheim SEM which was the synth module that was in the famous FVS (Four Voice Synthesiser) from 1978. This project uses 2 Pro Micros connected via the TX and RX pins. I needed 2 because it requires 32 ins and outs.        FVC connected to 2-XMs More info  here Low Cost Polyphonic Keyboard Controller for mono synths A much simpler and cheaper alternative to the 2-XM controller. Very cheap to build and still has an on board polyphonic ADSR. All controls are handled with CCs f...

Behringer 2-XM Polyphonic Controller This was the first iteration of the four voice controller for the Behringer 2-XM. It has now been superceded byt the Eurorack version which supports 10V outputs.    The 2-XM is based on the Oberheim SEM which was the synth module that was in the famous FVS (Four Voice Synthesiser) from 1978. I was lucky enough have one of these (courtesy of the record company!) and used it for live and recording until the mid 80s when it died! I still have one of the modules but the rest is long gone. I had given up all hope of ever replacing it until Behringer announced 2-XM which is a faithful but smaller recreation of the modern SEM (2000s). Each 2-XM is actually 2 SEMS  - can you see why it's called the 2-XM ;)  so if you have 2 units and a controller you would have the equivalent of the mighty FVS. Here is the finished prototype.... FVC connected to 2 x 2-XMs for a four voice system Short demo of the FVC features  2-XM Controller Feature...