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ReapSamplOmatic 5000 - note start and note end knobs not responsive to MIDI keyboard

 The issue you are describing with ReaSamplOmatic5000 (RS5K) often occurs because the plugin loses "focus" on the incoming MIDI data or the track settings are not maintaining a constant stream of information from your keyboard.

Based on the sources, ensure you have verified the following configurations to keep the "Note start" and "Note end" knobs responsive to your MIDI keyboard:

1. Ensure Track Arming and Input Monitoring

For RS5K to "hear" the notes from your MIDI keyboard so it can map them to the knobs, the track must be actively receiving MIDI data.

  • Record Arm: The track containing RS5K must be Record Armed (the red button should be lit).

  • Input Monitoring: You must have Input Monitoring enabled (the speaker icon on the track). If this is off, REAPER may not pass the MIDI signal to the plugin when you are not actively recording.

2. Verify MIDI Input and Channel Settings

If the note changes only once and then stops, there might be a mismatch in which MIDI channel the keyboard is sending and what REAPER is expecting.

  • Input Assignment: Right-click the track's Record Arm button and ensure Input: MIDI is set to your specific device and All Channels (or the specific channel your keyboard is using).

  • Channel Mismatch: Check if your keyboard or the plugin is accidentally set to a specific channel (1-16) that isn't matching the notes you are playing after the first attempt.

3. Check MIDI Device "Control" Preferences

For a MIDI device to interact with plugin parameters and knobs effectively, it needs specific permissions in REAPER's settings.

  • Go to Options > Preferences > Audio > MIDI Devices.

  • Find your keyboard in the list, right-click it, and ensure "Enable input for control messages" is checked. This allows the keyboard to act as a controller for parameters rather than just playing musical notes.

4. FX Window Focus and Input Options

Sometimes the FX window stops "listening" to the keyboard because it thinks you want to send those commands to the main REAPER arrangement instead.

  • Send Keyboard Input: In the FX window menu, go to Options and check "Send all keyboard input to plug-in".

  • Ignore Shortcuts: Conversely, ensure that "Ignore FX chain keyboard shortcuts (send to main window)" is not blocking the specific interaction you need.

5. Troubleshooting Steps

If the problem persists:

  • Baseline Reset: Double-click the knobs without pressing a key to reset them to their default values (e.g., Note start at 0/C-1 and Note end at 127/G9) and try the mapping process again.

  • Instance Check: Make sure you aren't trying to change these settings on a "Follower" track if you have set up a multi-sampling or VCA group, as the lead track might be overriding your manual changes.

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