One section, one loop, until it is clean.
JamJamz loops any section of a song from your own library, slows it down without changing pitch, and times every hit from your electronic kit against the real drum part. The tempo climbs only when you earn it.
Hit-by-hit feedback
It matches every hit from your kit to the nearest note in the chart, within 150 milliseconds. Each note is marked hit, early, late or missed, and stray hits are marked extra. Offsets are shown in real milliseconds, so they mean the same thing at any tempo.
- A verdict on every note in the loop
- Average timing for the right hand, left hand, toms and right foot
- Offsets in real milliseconds, not scaled by tempo
| Right hand | −8 ms | |
|---|---|---|
| Left hand | +21 ms | |
| Toms | −31 ms | |
| Right foot | +3 ms |
Tempo ladder
JamJamz slows the loop without changing its pitch, starting at 60 percent by default. After 3 clean passes in a row it raises the tempo by 5 percent, step by step, until you reach full speed. You can change the start, the step, the target and the clean passes needed.
- Pitch-preserving slowdown
- Defaults: start at 60%, step 5%, 3 clean passes to step up (adjustable from 1 to 10)
- Best clean tempo saved for every section
Your own song library
Any song in your Clone Hero songs folder that has a drum chart. JamJamz reads notes.mid, notes.chart and .sng packages where they sit, plus song.ini for the title and artist. It never copies, changes or uploads your files, and it remembers the folder between visits.
Keeps pro drums data, so cymbals and toms are told apart
Section loops
Pick a section from the chart's markers, such as a chorus or a fill, or drag across the bars you want. JamJamz loops it with a count-in before every pass, so you can repeat one hard spot until it is clean instead of restarting the whole song.
Metronome click off, during the count-in only, or all the way through
Notation and highway
The loop is drawn as standard drum notation with a moving playhead, and each note is colored by how you played it. Beside it runs a scrolling note highway, either a Rock Band style track or plain lanes, so you can read whichever suits you.
Track or lanes highway view
Kit mapping and calibration
Electronic drum kits that connect over USB-MIDI. A map for the Alesis Nitro Mesh is built in, and learn mode maps any other kit: hit a pad, then choose what it is. A short tap-along test measures your setup's delay, so your timing is judged fairly.
| Pad | MIDI notes |
|---|---|
| Kick | 35, 36 |
| Snare, rim, cross stick | 38, 40, 37 |
| Hi-hat closed, open, edges | 42, 46, 22, 26 |
| Toms 1, 2, 3 | 48 50 · 45 47 · 43 41 |
| Crash | 49, 55, 57 |
| Ride, edge, bell | 51, 59, 53 |
Hands and feet
Switch a loop to hands only or feet only, then put it back together. JamJamz judges only the part you chose, so you can lock in the kick pattern or the hand pattern on its own before playing everything at once.
Progress per section
It saves progress per song, difficulty and section: your best clean tempo, how many notes you played on time, and your timing per limb. Each section shows its best tempo, so you can see at a glance which parts are solid and which need work.
Not a rhythm game
No scores, combos, star power or leaderboards. JamJamz measures how close each hit lands to the real drum part and helps you build one section up to full speed.
Planned
- AI coach
After a session, a coach will read a short summary of your stats, never your raw hits, spot habits across songs, such as a left hand that rushes fills, and suggest what to practice next. The timing math stays in code; the coach only interprets it.
- Play from notation or memory
You will be able to hide the highway and play from the notation alone, or from memory, so the highway does not become a crutch. Today the notation and the highway are shown side by side.
- Desktop app
A downloadable desktop app will wrap the same JamJamz in its own window, with direct access to your song folder. Today JamJamz runs in desktop Chrome or Edge, which support the kit and folder access it needs.