Auto-Sampler

This was the feature I most wanted. Sampling a synth manually is tedious: play a note, record it, trim it, play the next note, repeat 8 times. The Auto-Sampler does all of that automatically.

Point it at a hardware synth or VST, tell it what notes to sample and it sends MIDI, records audio and trims everything for you. A complete multisample in minutes instead of hours.

Step-by-step sampling guide:

1. Configure Note Range & Timing
   • Lowest Note: Starting note of your range (e.g., C3)
   • Highest Note: Ending note of your range (e.g., C5)
   • Number of Samples: How many notes to sample (2-8)
   • Note Duration: How long each note plays (in seconds)
   • Gap Between Notes: Silence between samples (in seconds)
2. Select Devices & MIDI
   • Audio Input Device: Select BlackHole or VB-Cable
   • MIDI Output Device: Select IAC Bus or loopMIDI port
   • MIDI Channel: Usually channel 1 (match your DAW/synth)
   • Velocity: MIDI note velocity (0-127)
3. Configure Audio Processing
   • Auto-trim: Removes silence from start/end
   • Normalise: Maximises volume without clipping
   • Fade in/out: Smooths transitions
   • Envelope shaping: Attack and release adjustments
4. Test Your Setup

   Click "Test Setup" to send a single MIDI note and verify both MIDI and audio are working correctly. You should hear the note and see audio levels.

5. Start Sampling

   Click "Start Auto-Sampling" and the app will automatically:

   • Calculate evenly-spaced notes across your range
   • Send MIDI notes one at a time
   • Record the audio output
   • Process each sample (trim, normalise, fade)
   • Display progress in real-time
6. Export to Sample Editor

   When sampling completes, click "Send to Sample Editor" to load all samples into the Multisample editor where you can fine-tune parameters and save to your EP-40.

To sample a hardware synthesizer:

1. Connect your hardware synth's audio output to your computer's audio interface
2. Connect MIDI out from your computer to the synth's MIDI in
3. In Auto-Sampler, select your audio interface as the Audio Input Device
4. Select your MIDI interface as the MIDI Output Device
5. Set the MIDI channel to match your synth's receive channel
6. Configure note range and timing
7. Start auto-sampling

To sample a VST instrument in your DAW:

1. Open your DAW and load the VST you want to sample
2. Create a MIDI track with the VST as the instrument
3. Set the MIDI track's input to your virtual MIDI port (IAC Bus or loopMIDI)
4. Arm the track for recording (if required by your DAW)
5. Set your DAW's audio output to BlackHole or VB-Cable
6. In Auto-Sampler, select BlackHole/VB-Cable as Audio Input
7. Select the virtual MIDI port as MIDI Output
8. Start auto-sampling