I am running Reason rewired through Ableton Live. I would like to be able to control one of the parameters of a Subtractor Synthesiser within Reason whilst rewire is active. The actual parameter is a LFO rate.

Currently, the best solution I have come across is to create a different clip for each LFO oscillation rate and set a different envelope automation level to each clip (the clips contain no notes). In this case, I assign a different MIDI trigger to each of the LFO rates I'd like to use live.

However, this is a little cumbersome. First of all, I'd like to avoid having to actually launch my Ableton set, since in my experience, this is when things are most likely to crash (I'm using Ableton in Windows with a bunch of VSTs, and believe me, this is a recipe for disaster on stage if I hit the play button). Secondly, in order to control the LFOs by this method I need several trigger buttons free; ideally I'd be able to use a rotary and adjust it on-the-fly.

Any ideas how I can access the parameter? I know that the 'LFO rate' from Reason is mapped to MIDI CC #26, but I can't seem to control this through direct CC assignment from my MIDI controller either; presumably Ableton hijacks MIDI ports when it is open, so I need to have something that involves Ableton.

  • Are you trying to control it with a MIDI device? You have to send the midi signal back to Reason through Ableton.
    – Tony
    Commented Apr 4, 2013 at 19:19
  • Yes, I am using a MIDI device (see question title). I know that I need to send the signal to Reason, my question is how do I do this whilst rewire is active...
    – CaptainProg
    Commented Apr 5, 2013 at 11:31
  • Can you use a MIDI Loopback port, send the outputed signal to the input of the virtual MIDI port and control reason as so?!
    – JSmith
    Commented Jul 5, 2017 at 20:02
  • Are you on Mac or PC? Commented Sep 28, 2021 at 20:17

1 Answer 1


If I understand you correctly, you want to automate reason perimeters through Ableton Live. I found a really good youtube video on this topic:

Hope this helps! Hiren

  • 2
    This video is exactly how I arrived at the situation I describe in my question. What I would like to do is control the MIDI parameter directly; i.e. not through the use of clips. This is exactly the same question that the guy in this video asks!
    – CaptainProg
    Commented Feb 21, 2013 at 16:29

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