![]() ![]() This lets you route the filter or amp envelope to resonance or send the LFO to the external input and play its pitch via the keyboard, giving you an additional oscillator. Luckily, Behringer has seen fit to expand upon the original’s sound design capabilities by including six additional CV ins and five outs. And a recent firmware update has made the amp envelope even snappier. The filter has its own ADSR envelope, and there’s a snappy envelope for the amplifier, too. The only downside with this filter design, like many others, is that you lose a lot of low-end as you increase the resonance, so you have to consider this when designing sounds. The filter is characterful and squelchy, and at high resonances, it allows you to easily pick out frequencies, even moving into self-oscillation. The triangle wave on Osc B makes an excellent sub, and if you want a cleaner sine wave, you can use the capable 24dB/octave (4-pole) low-pass filter. Listen to the sound examples below for examples ranging from warm and subby to piercingly bright, resonant and nasal. With facilities such as waveshape blending, oscillator sync and pulse-width control, you can get a decent variety of timbres from the Pro-1. You also have a sync switch on Osc A, and the ability to turn Osc B to low-frequency mode and detach it from the keyboard input to use it as an extra LFO. ![]() Both have pulse-width controls, and you can blend the levels using the mixer section, where you can also dial in a noise oscillator or an external input signal. This allowed individual MIDI in/outs to actually be more in time with each other as the MIDI interface multiplexed the data stream from the computer to the individual hardware outs.On to the synth specs, and we have dual analogue VCOs with three simultaneous waveforms. Many manufacturers like Motu made MIDI interfaces for computers that would stream MIDI much faster between the software and the interface than the interface would stream to the MIDI devices. Those last 2 wires could have allowed faster parallel data transfer or maybe a separate sysex / note transmission bus implementation. There was probably supposed to be a MIDI II convention that never got written or adopted. 1/3 don't do anything! I believe that under the original MIDI specifications there was 5 cables allotted for future implementations. PS: In case you are wondering why I only attached 3 of the 5 connections for the MIDI jacks, The only connections actually used on a MIDI cable are 2/4/5. I flipped the orientation of the RC cable harness wires so they wont get confused if the synth is disassembled in the future. The MIDI board was placed on the opposite side of the instrument to keep it away from the audio path and closer to the power section. I used a small drill bit to make pilot holes for the 3 jack locations and a larger stepped drill bit to enlarge them to the final size. I also wanted to mount them on the 45 degree angle so that they would underline the Pro One logo. I was most concerned with making the MIDI jacks I was adding look good on the back of the synth. Here's a breakdown of what it entailed:ġ, Holes were drilled in the bottom plate of the synth to add the MIDI daughter board.Ģ, Holes were drilled in the back ( this is the scary part! ) of the synth to add MIDI in out and through jacks.ģ, I made a wiring harness out of RC servo cables to attach the MIDI board to the new CPU and to the MIDI in out and through jacks.Ĥ, The wiring harness was done so that there's connectors between all the boards which makes future work easier to accomplish. I tend to measure by eye 3 times and then cut later after measuring one last time. I believe the saying goes something like "measure twice, cut once". The CPU upgrade was pop and drop and non destructive but the MIDI part of the project required drilling! I broke this tech project into 2 parts because I had some intense and somewhat stress inducing decisions to make about the second half of this affair. I got the cables I ordered and they worked out just as I had hoped. So here we go, it's part 2 of the Sequential Circuits Pro One CPU/MIDI upgrade! I had ordered some parts and was waiting for them to arrive when I left off in the previous tech post here. ![]()
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