Having always loved the track and that sound I figured it would be useful to learn how to do it in Reason. I figured the best way to start would be with an ARP2600 emulator, so I grabbed the demo of Cherry Audio's CA2600 ( having been impressed with their other synths recently ). Once I got it working I had a go in Subtractor but couldn't really get it right, I'll probably have a go with some of the other Reason synths later though.
First here is the patch for the CA2600 in a zip file
Having not used a patch type vst like the CA2600 before there was a bit of a learning curve and a few puzzlements along the way such as 'such as semi-normalled connections', but the documentation was pretty good. I think I figured most things out to match the steps in the above video, though I don't feel its quite right yet, its pretty close.
The main aspects I changed were
- Cutoff Freq = 60.98Hz
- Resonance = 99.76
- Slope = 12 db
- VCO3 Amount = 85%
- Keyboard Amount = 100%
- Initial Freq = 8'
- Fine Tune = -6.02
- Disable Keyboard CV in
- Take ramp down to 'Voltage Processors' in order to invert it into a sawtooth, then back up to VCO3 sync.
The CA2600 has fixed steps for the VCO, so I settled on using 8' and fine tuning down to almost the max. The fine tune apparently provides just over +/- fifth, so I figured this was a good way to move it down to a G key like in the video. If I understand the video right then I guess maybe the Cutoff Freq should also be around a G key, but that's either 48 Hz or 98 Hz, but I found 60 Hz to sound better.
The CA2600 doesn't have a sawtooth, so they suggest inverting the ramp wave. Doing this results in a subtle but noticeable change to the sound.
I'm still playing with the patch and will post back if I make any major improvements.