The aim of this exercise is to set up a basic 8 channel mixer for a Reaper project. This will work on the minimum 3 DSP Luna card with DSP to spare. It will include routing to allow recording of live signals from you card's analog input, and routing to loop the entire mix back to Reaper for final mixdown.

  1. Create a new Scope project and add:
  • ASIO Source (8 channels),
  • STM 1632 Mixer, 
  • ASIO Destination (2 Stereo Channels) 
  • Analog Source
  1. Connect the components as shown ===>

  1. Double click on the STM1632 mixer so that the full graphical view opens.

  2. Click into the small track name space under the channel 1 fader and type 'Bass' (or whatever name you want to give it).

  3. Rename the other 7 channels appropriately as per example shown.


  1. Open Reaper.  If you are prompted for Audio Settings then just select Audio / Device.  If not just select 'Preferences' from the Options menu and select 'Audio / Device'.

  2. Select 'ASIO' from the 'Audio System' drop-down.

  3. Select 'ASIO SCOPE' from the ASIO Driver drop-down.

  4. Click on the 'Enable Inputs' check box to set it checked.

  5. Select the first numbered Scope Input from the 'first' input drop-down.

  6. Select the last numbered Scope Input from the 'last' input drop-down.

  7. Select the first numbered Scope Output from the 'first' output drop-down.

  8. Select the last numbered Scope Output from the 'last' output drop-down.

  9. Select the 'OK' push button.

  1. In Reaper, select 'Track / Insert New Track' from the Track menu.

  2. Select the newly created track and overtype the track title with 'Guitar'.

  1. Select the small 'io' icon to the right of your track title.  A 'Routing for Track' window will pop up.

  2. Select 'Out 9 Scope / Out 10 Scope' from the 'Add new hardware output' drop-down.  Note this corresponds to stereo channel 5 on your STM mixer as two Scope outputs in Reaper correspond to one stereo channel on the Scope STM1632 mixer. 

  3. Uncheck the 'Master/Parent Send' check box.  Do this to prevent this channel from being output to your first Scope output as well as the nominated (5th) one.

  4. Close the 'Routing for Track' pop-up window.


  1. Select the small 'ar' icon to the left, below your track title.  This will arm your Guitar track for recording.  A small 'inputs' drop-down should appear below the track slider.

  2. Leave the default setting of 'In 1 Scope' selected in the input drop-down box.

  3. Play your instrument to check that an input signal appears.  Level graphics should appear just to the right if the 'inputs' drop-down.

  4. Press the red 'Record' button and record your instrument.

  5. Press 'Stop' when finished.


  1. For each additional track you wish to overdub, repeat the above three steps (e.g. the 'Adding the Audio Track', 'Setting the Output of the Audio Track' and 'Recording the Audio Track' steps). 

  2. Ensure that you record disarm all previous tracks such that only your current recording track has the 'ar' icon glowing red.

Dante September 2010