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User support · Version 1.5

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MIDISplitter 1.5
Support

Open, audition, shape, and reuse your MIDI tracks.

Watch the 13-chapter video guide, read the user manual, and find answers for the current Mac App Store release.

Watch the Video Guides Read the 1.5 User Manual Contact Support Privacy Policy

Installing or updating? Open MIDISplitter on the Mac App Store. Requires macOS 15 or later.

Start here

Your first MIDI export

  1. Open a file. Choose File > Open (Command-O), or drag a supported MIDI file onto the main drop area.
  2. Choose what to hear. Leave all track checkboxes unchecked to use every track, or check the parts you want. Use the main Play button for the group or a track’s Play button to audition that part.
  3. Make your changes. Stop or pause before editing the mix, pitch, or tempo. To change an instrument, highlight its track and press Control-I.
  4. Export a copy. Use Split All for separate tracks, Export N for separate checked parts, or Merge for one combined file. For a selected merge, check at least two tracks. Choose MIDI 1.0 (.mid) for broad compatibility, or supported MIDI 2.0 output for a compatible destination.
  5. Check the result. Open the exported MIDI in your destination software and confirm the parts, timing, and instruments.

Read the complete getting-started instructions →

The MIDISplitter 1.5 video guide

Watch. Try it. Make it yours.

Follow all 13 chapters in order or jump straight to the tool you need. Each chapter includes a direct YouTube link if you prefer to watch there.

What changed

New and expanded in version 1.5

Version 1.5 builds on the original track renaming, melodic Instrument Picker, auditioning, tempo and pitch adjustment, volume mixing, splitting, and merging. The additions below make it easier to work with rhythm, loops, larger arrangements, and supported MIDI 2.0 files.

Audio Beat Detection

Drop a supported audio recording onto the main window to estimate its tempo. Review candidates, use tempo-ratio corrections, or enter a known BPM, then apply it to a loaded beat-based MIDI song.

Useful for setting a MIDI arrangement to the tempo of an existing recording. Analysis covers the full accepted recording within the app’s resource limits; it does not transcribe audio into MIDI or stretch the audio.

Beat Detection instructions

MIDI 2.0 file support

Open supported MIDI Clip/SMF2 files (.midi2, .smf2, and .clip) and export .midi2 clips. Eligible unchanged native packets can be preserved; conversion and omission information explains the result.

This brings supported newer file formats into the split-and-merge workflow. Editing uses MIDI 1.0-resolution values, and preservation is conditional—not a promise that every MIDI 2.0 feature round-trips unchanged.

File-format scope and limits

Looped playback and audition

Enable Loop and place start and end markers around a passage. Listen to that range with the full arrangement, a checked group, or one track.

Repeat a verse, drum pattern, or musical phrase while checking the notes and instrument choices, without repeatedly returning to the same position by hand.

Choose and audition a loop

Export MIDI Loops window

Refine and snap loop boundaries, preview the passage, and choose 1–999 repeats. Export separate loop stems or a merged loop for reuse in another MIDI application.

The preview prepares four cycles independently of the final export repeat count. A brief pause when that preview batch restarts is not silence inserted between exported repetitions.

Loop export instructions

LED-style track activity meters

The Mixer shows activity for the tracks being heard during playback, audition, and loop preview.

See which parts are active and follow a dense arrangement more easily. These are MIDI activity indicators, not measured audio peak or clipping meters.

Read the Mixer meters

Pan, velocity, and reverb controls

Position parts left or right with Pan. Open Advanced Mixer to shape note strength with Velocity and request a synthesizer reverb amount with Reverb, alongside the existing Volume faders.

Prepare the balance and character of your parts before export. Stop or pause first; these controls are not live fader automation. Reverb response depends on the receiving synthesizer, and chosen mix values replace source controller automation in these editing paths.

Mixer controls and export behavior

Stereo master MIDI activity meter

Independent left and right indicators in the main window reflect the active parts and their pan positions. They clear when playback stops.

Follow overall MIDI activity without opening the Mixer. The indicators do not measure speaker output or prove that your Mac is producing audible sound.

Playback and master meter

Separate Tempo, Mixer, and Pitch resets

Tempo Reset restores the loaded file’s complete tempo map. Mixer Reset restores the loaded volume, pan, velocity, and reverb values for every track, including unchecked and offscreen tracks. Pitch Reset returns transposition to zero.

Compare an edit with its starting point without resetting unrelated settings. These buttons do not undo names, instruments, drum mappings, or loop markers.

What each Reset restores

Dedicated Drum Instrument Picker

Highlight a Channel 10 track and press Control-I to choose a drum sound from the General MIDI Standard Kit. For a melodic track, open the Instrument Picker and choose Choose GM Drum Kit.

Turn a rhythmic part into a kick, snare, hi-hat, or another individual percussion sound. Applying the choice moves the track to Channel 10 and maps all its note events to that one drum sound; it does not preserve a mixed-drum pattern while merely changing kits.

Instrument and drum selection

Scrolling Loop Export timeline

Scroll vertically through the included tracks while the ruler, loop markers, and playhead remain visible. The window shows up to sixteen readable lanes at a time, or fewer on smaller screens.

Inspect larger arrangements without losing access to the loop boundaries. Scrolling does not alter the selected tracks, range, or repeat count.

Navigate the loop timeline

Playback-only volume

A 0–100% main volume slider controls listening volume for playback, auditions, and loop preview without changing Mixer values or exported MIDI.

Listen at a comfortable level while keeping the export mix intact. Settings can remember the last level; with that preference off, future launches start at 75%.

Listening-volume behavior

Searchable, offline User Manual

The built-in Help manual includes topic navigation, step-by-step workflows, shortcuts, troubleshooting, and a MIDI glossary. Search narrows its topic list.

Look up a control while working, even without an internet connection. The online edition linked here presents the retail Help content and can be searched with your browser’s Find command.

Open the online 1.5 User Manual

Optional text export reports

Save a readable report beside a merged export or one master report for a split batch. It records export details, effective tempo and key when available, and MIDI 2.0 preservation or conversion information.

Keep a record of what was generated, check compatibility warnings, or provide useful context when asking for help.

Save and interpret export reports

More usable large-track layouts

The main track list adapts to the loaded file and scrolls for additional tracks. The Mixer uses a scrolling layout with up to sixteen strips visible at once and retains settings for offscreen tracks.

Reach every part of a larger arrangement while keeping the interface manageable. Sixteen is a visible-layout limit, not a total-track limit.

Working with larger mixers

Saved workflow preferences

Settings lets you show or suppress MIDI 2.0 import-report popups, remember playback volume, preselect text reports for new exports, and remember app-window positions.

Reduce repeated setup while keeping important errors visible. Report-popup preferences do not change conversion or file contents, and you can still change the report choice for each export.

Settings and their defaults

Know your files

Compatibility and useful limits

Read Formats & Timing and Audio Beat Detection for details.

Quick checks

Troubleshooting

I see activity but hear no sound

Check the main Playback Volume slider, your Mac’s output device and mute setting, and the track’s Mixer volume and velocity. Confirm that notes occur at the current position. Stop, return to the beginning, and audition one track. Activity meters are not audio meters. SMPTE playback requires compatible external software.

The wrong tracks or only a short section were exported

Use track checkboxes, not just the row highlight. No checked boxes means all tracks. Export N creates separate files; Merge N combines at least two selected tracks. Outside Loop mode, Merge All still merges every track when just one is checked. Turn Loop off to export the whole song.

A file will not load or an export fails

Read the exact status message. Confirm the format and resource limits, make cloud files available locally, and try a small known-good file. Export to a writable folder with free space, not over the loaded source. If only the text report fails, inspect the folder: the MIDI export may already have succeeded.

A control is unavailable or a loop sounds wrong

Stop or pause before changing pitch, tempo, or mix values. For loops, check the start and end markers against note attacks and sustained notes. A brief restart after four export-preview cycles differs from a gap in the exported loop; compare a saved file with two or more repeats.

I want to restore the original

Use the separate Pitch, Tempo, or Mixer Reset buttons to restore that group of values. To discard all session edits, reopen the original MIDI file. Export wanted changes first: reopening also discards instrument choices, drum remapping, names, and other unsaved work.

Read the full troubleshooting section →

Need help with MIDISplitter 1.5?

Email contact@newtoysoftware.com. Include your macOS version, MIDISplitter version and build, the operation you were performing, and the exact error message or steps to reproduce the issue.

A screenshot or export text report can help. Review reports for private information and share example MIDI or audio files only if you have permission. The email link opens your mail app; it does not send a message or attach files automatically.

Privacy and your files

MIDISplitter processes MIDI files and analyzes audio locally on your Mac. A file stored with a cloud provider may first need to download through macOS. Read the New Toy Software Privacy Policy for information about privacy and support correspondence.

Documentation updated September 16, 2026 · MIDISplitter 1.5