Cockos Reaper
Setup Guide


Guide for setting up the Modulation Processor 3244 within Reaper.

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External Devices

Using MIDI CC

To modulate an external hardware device, such as a synthesizer, via MIDI CC, please follow the steps described in this section.

  1. Create a new "Virtual Instrument" track and select the Modulation Processor 3244 plug-in. Reaper will ask you if you want to add additional tracks. For MIDI CC and MIDI SysEx you do not need additional tracks: click > No.
  2. Configure the Modulation Processor. Select "MIDI To Host" on the "Output" section and make sure, that the Format is set to "MIDI CC".
  3. Open the track "Routing" and configure the MIDI output routing according to your setup, so that the MIDI messages are sent to the external synth.
  4. Record your MIDI data on the MP3244 track. You may need to set the MIDI input on the MP3244 track according to your setup.

Using MIDI SysEx

This section applies to Windows and Mac platforms. Reaper dose not allow to path thru SysEx messages from a plug-in. To get this working you need to have system wide virtual MIDI ports, or, if you are using Mac OS X you can also follow the steps described in the section "Using MIDI SysEx (Mac)", which dose not require virtual MIDI ports. If you have no virtual MIDI ports, please check this Virtual MIDI Guide. For each SysEx device you need to create a separate virtual MIDI port.

  1. Setup virtual MIDI ports in Reaper. Go to Options > Preferences > MIDI Devices. For the virtual MIDI input port "Enable input". For the virtual MIDI output port "Disable Output".
  2. Create a new "Virtual Instrument" track and select the Modulation Processor 3244 plug-in. Reaper will ask you if you want to add additional tracks. For MIDI CC and MIDI SysEx you do not need additional tracks: click > No.
  3. Configure the Modulation Processor. Within the "Output" section select "MIDI SysEx" as "Format" and as "Device" select the created virtual MIDI port.
  4. Make sure to select the MIDI input port where e.g. your master keyboard is connected. Do not use "All MIDI inputs", since this will lead into receiving the SysEx data on this track as well.
  5. Open the track "Routing" and configure the MIDI output routing according to your setup, so that the MIDI messages are sent to the external synth.
  6. Create a new "MIDI Track" to receive the SysEx messages. Make sure to set the MIDI input to the virtual MIDI port.
  7. Open the track "Routing" and configure the MIDI output routing according to your setup, so that the MIDI messages are sent to the external synth.
  8. Make sure to turn on "Record Monitoring: ON" and "Record Armed". Remember to record your MIDI data on the MP3244 track.
  9. Congratulations, your done!

Please Note: since the SysEx messages are sent to system wide virtual MIDI port also other channels may receive the SysEx messages and pass these to your MIDI device. To avoid this, make sure to select for all MIDI and Instrument tracks an explicit MIDI input port.

Using MIDI SysEx (Mac)

This section applies to Mac platforms only and is an alternative to the setup described above. It describes how to setup Reaper to send MIDI SysEx Messages to an external device without using a virtual MIDI port. Reaper dose not allow to path thru SysEx messages from a plug-in. To get this working you simply need to send the messages directly to the MIDI port where the external device is located. In general this works on a Mac. However, if you encounter problems connecting the host and the plug-in to the same MIDI port, you need to follow the steps described in the "Using MIDI SysEx" section above, which circumvents this problem.

  1. Create a new "Virtual Instrument" track and select the Modulation Processor 3244 plug-in. Reaper will ask you if you want to add additional tracks. For MIDI CC and MIDI SysEx you do not need additional tracks: click > No.
  2. Configure the Modulation Processor. Within the "Output" section select "MIDI SysEx" as "Format" and as "Device" select the MIDI port where your device is connected.
  3. Open the track "Routing" and configure the MIDI output routing according to your setup, so that the MIDI messages are sent to the external synth.
  4. Record your MIDI data on the MP3244 track. You may need to set the MIDI input on the MP3244 track according to your setup.

Using Audio CV

To modulate an external hardware device, such as a synthesizer, via Control Voltages, please follow the steps described in this section.

In AUDIO CV mode the plug-in functions as a multi-channel plug-in with following configurations:

  • Main Out: No output
  • Output 1 L/R = VCA 1
  • Output 2 L/R = VCA 2
  • Output 3 L/R = VCA 3
  • Output 4 L/R = VCA 4
In order to setup correctly, you need to "Activate" the additional Outputs.

  1. Create a new "Virtual Instrument" track and select the Modulation Processor 3244 plug-in. Reaper will ask you if you want to add additional tracks. For Audio CV you need additional tracks: click > Yes.
  2. Configure the Modulation Processor. Select "Audio CV" as "Format" on the "Output" section. If "Audio CV" is disabled you need to enable it: "Settings" > "Audio CV Settings" or "Register" > "Audio CV Settings".
  3. Open the track "Routing" and configure the MIDI output routing according to your setup, so that the MIDI messages are sent to the external synth.
  4. Select for each AUX channel a physical output from your audio interface to which the CV data will be sent and make sure to switch off the "Master send" option.
  5. If you want to use one physical output for two CV signals you can select for two "Audio Track" the same output and set the pan for one channel all the way Left and the other all the way Right.
  6. Congratulations, your done!

Internal Devices

In-Host MIDI CC

To modulate a software device, such as a synthesizer via MIDI CC, please follow the steps described in this section.

  1. Create a new "Virtual Instrument" track and select the Modulation Processor 3244 plug-in. Reaper will ask you if you want to add additional tracks. For MIDI CC and MIDI SysEx you do not need additional tracks: click > No.
  2. Configure the Modulation Processor. Select "MIDI To Host" on the "Output" section and make sure, that the Format is set to "MIDI CC".
  3. Create a second "Virtual Instrument Track" and add the software device, which you would like to control.
  4. Open the track "Routing" on the "Virtual Instrument Track" and set the MIDI input (Receives) to the MP3244 MIDI output to receive MIDI messages for your internal synth. All MIDI data (notes) that you record should be on the Modulation Processor Track! This is needed to trigger the Slope and Envelope Generators.
  5. Within VCA1 select the Continuous Controller number you want to send. If your virtual synth has a MIDI learn function you can choose any number.

    A: MIDI learn function
    This only applies if your virtual synth has a MIDI learn function: enable MIDI learn and click on the desired parameter. Go to the MP3244 and “twittle” the VCA1 GAIN knob. The synth should now receive the CC messages. As soon you are finished, turn the MIDI learn function off.

    B: No MIDI learn function
    If your synth does not provide any MIDI learn function you need to grab the synth manual and see if and what MIDI CCs are available. To modulate the CC you need to select the specific CC number within the VCA1 of the MP3244.
  6. You are all set!

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