# Device checkpoint A

Projects written by the Go writer (`internal/xpj`, `internal/project`, `internal/export`) through `mpckit-cli`, for build plan section 7, checkpoint A. Build the pack from the repo root:

```
tools/checkpoint-a/build.sh            # writes mpckit-checkpoint-a.zip
```

It needs Go and `python3` (for the zip). Samples come from `testdata/device/DemoFile_[ProjectData]`; the test tones come from `gentone`, which writes the same tone as the WAV test pack (0.8 s at 440 Hz, then a 0.2 s beep an octave higher as an end marker).

Each risky item is in its own project, so one that fails to load does not hide the others.

## Projects and what to check

### MpckitKit: kit, tuning extremes, choke, lengths (A1, A2, A3, A5)

| Pad | Sample | Setting |
|---|---|---|
| A1 | kick | |
| A2 | snare | |
| A3 | hat 1 | mute group 1 |
| A4 | hat 2 | mute group 1 |
| B1 | bass (C) | none: the reference pitch |
| B2 | bass | -24 semitones |
| B3 | bass | +24 semitones |
| B4 | bass | -90 cents |
| B5 | bass | +90 cents |
| B6 | bass | -24 semitones, -90 cents |
| B7 | bass | +24 semitones, +90 cents |

Sequences: 1 "One Bar" (120 BPM, 1 bar), 2 "Long" (120 BPM, 64 bars).

1. The project loads; A1-A4 and B1 play.
2. B2-B7 show the tuning in the table and sound shifted against B1 (two octaves down/up for B2/B3, just under a semitone for B4/B5).
3. A3 and A4 cut each other off. Note the highest mute group number the device's pad settings offer.
4. Sequence 1 shows 1 bar and sequence 2 shows 64 bars; both loop at their length.

### MpckitMute: high mute group numbers (A3)

A1 and A2 (hats) in group 16; A3 and A4 in group 32.

1. Does the project load?
2. What group does each pad show? Do A1/A2 choke each other, and A3/A4?

### MpckitTempo: BPM extremes (A5)

Kick on A1. Sequences: 1 "Slow" 30 BPM, 2 "Fast" 300 BPM, 3 "Very Slow" 20 BPM, 4 "Very Fast" 999 BPM (2 bars each).

1. Does the project load?
2. What BPM does each sequence show? (20 and 999 are probably outside the device's range: note whether it clamps them, and to what. Also note the device's own BPM range from its tempo control.)

### MpckitWav: extensible WAV headers (section 7, "Not yet tested")

| Pad | File |
|---|---|
| A1 | 44.1 kHz 16-bit mono, plain header (control) |
| A2 | 48 kHz 24-bit stereo, extensible header |
| A3 | 44.1 kHz 16-bit stereo, extensible header |
| A4 | 44.1 kHz 16-bit mono, extensible header |

1. The project loads, and A2-A4 match A1 in pitch and length, with the end beep heard.

## Results

To fill in after the device run, then copy into the format doc (section 7) and the build plan (section 7, checkpoint A).

| Project | Loads | Result |
|---|---|---|
| MpckitKit | | |
| MpckitMute | | |
| MpckitTempo | | |
| MpckitWav | | |

Device mute group range: 
Device BPM range: