The Roland HandSonic HPD-15 hand drum includes some tuned percussion instruments. You can edit the pitch of each pad in cents. The pads are grouped into 3 sets of 5, as shown:

You can edit the pitch of each pad individually, and further adjust the pitch of an entire set (A, B or C). The pad set adjustment is very helpful when creating a patch for any HPD-15 instrument that is voiced for a higher or lower octave.

After several experiments, I finally settled on this arrangement of the Bohlen-Pierce scale notes. It is fully chromatic from D to D’. I didn’t include a low Db as it seemed less important than the high D’ for modal music.

I tuned the notes to the C Lambda scale in just intonation with A=440 Hz (pad A2). The first song recorded with this system was Fuse Blue. The HPD-15 is somewhat buried in the final mix. I’ve created a separate MP3 file of just the HandSonic tracks so that you can hear what it sounds like:

I’m happy to answer any technical questions from other HandSonic players who are into BP or other alternate scales. The HPD-15 isn’t a real sensitive instrument, but its fine tuning capabilities make it a very useful tool for creating a variety of sounds in real time performance. I advise using a good frequency meter when tuning, as the readout of cents isn’t really very accurate. The tables below contain the fine tuning adjustments that I developed for several of the unit’s virtual instrument voices.

C Lambda Just Intonation on Roland Handsonic HPD-15 | |||||||

Midrange Voicings | A49:Gender | T43:SynStrings | S13:Drip | ||||
---|---|---|---|---|---|---|---|

note | frequency | pad | cents | pad | cents | pad | cents |

C2 | 188.57 Hz | A5 | -567 | A5 | -1767 | A5 | -1768 |

Db2 | 203.66 Hz | -433 | -1634 | -1631 | |||

D2 | 224.49 Hz | A3 | -265 | A3 | -1464 | A3 | -1464 |

E2 | 242.45 Hz | A4 | -132 | A4 | -1332 | A4 | -1331 |

F2 | 264.00 Hz | A1 | +16 | A1 | -1184 | A1 | -1175 |

Gb2 | 288.63 Hz | B1 | +170 | B1 | -1030 | B1 | -1030 |

G2 | 314.29 Hz | B2 | +317 | B2 | -881 | B2 | -874 |

H2 | 339.43 Hz | B3 | +451 | B3 | -748 | B3 | -744 |

Jb2 | 369.60 Hz | B4 | +598 | B4 | -602 | B4 | -600 |

J2 | 404.08 Hz | B5 | +753 | B5 | -448 | B5 | -436 |

A3 | 440.00 Hz | A2 | +900 | A2 | -298 | A2 | -290 |

Bb3 | 475.20 Hz | C1 | +1033 | C1 | -166 | C1 | -161 |

B3 | 523.81 Hz | C2 | +1202 | C2 | +2 | C2 | +8 |

C3 | 565.71 Hz | C3 | +1335 | C3 | +135 | C3 | +135 |

Db3 | 610.97 Hz | C4 | +1469 | C4 | +268 | C4 | +269 |

D3 | 673.47 Hz | C5 | +1637 | C5 | +439 | C5 | +439 |

High Voicings | T66:Fantasia | ||
---|---|---|---|

note | frequency | pad | cents |

C3 | 565.71 Hz | A5 | -1073 |

Db3 | 610.97 Hz | ||

D3 | 673.47 Hz | A3 | -770 |

E3 | 727.35 Hz | A4 | -638 |

F3 | 792.00 Hz | A1 | -490 |

Gb3 | 865.89 Hz | B1 | -335 |

G3 | 942.86 Hz | B2 | -188 |

H3 | 1018.29 Hz | B3 | -55 |

Jb3 | 1108.80 Hz | B4 | +94 |

J3 | 1212.24 Hz | B5 | +246 |

A4 | 1320.00 Hz | A2 | +395 |

Bb4 | 1425.60 Hz | C1 | +530 |

B4 | 1571.43 Hz | C2 | +705 |

C4 | 1697.13 Hz | C3 | +828 |

Db4 | 1832.91 Hz | C4 | +965 |

D4 | 2020.41 Hz | C5 | +1133 |

Low Voicings | T34:FunkBass | T33:FingBass | T01:Ac.Piano | ||||
---|---|---|---|---|---|---|---|

note | frequency | pad | cents | pad | cents | pad | cents |

C0 | 20.95 Hz | set | -700 | ||||

Db0 | 22.63 Hz | ||||||

D0 | 24.94 Hz | -1668 |
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E0 | 26.94 Hz | -1548 |
|||||

F0 | 29.33 Hz | -1388 |
A1 | -1388 | |||

Gb0 | 32.07 Hz | -1232 |
B1 | -1232 | |||

G0 | 34.92 Hz | A5 | -1086 | B2 | -1086 | ||

H0 | 37.71 Hz | A4 | -954 | B3 | -954 | ||

Jb0 | 41.07 Hz | A3 | -805 | B4 | -805 | ||

J0 | 44.90 Hz | A3 | -652 | B5 | -652 | ||

A1 | 48.89 Hz | A1 | -506 | A2 | -506 | ||

Bb1 | 52.80 Hz | B1 | -372 | C1 | -372 | ||

B1 | 58.20 Hz | B2 | -202 | C2 | -202 | ||

C1 | 62.86 Hz | B3 | -70 | A5,C3 | -70 | A5 | -1767 |

Db1 | 67.89 Hz | B4 | +63 | C4 | +63 | -1634 | |

D1 | 74.83 Hz | B5 | +232 | C5 | +232 | A3 | -1464 |

E1 | 80.82 Hz | A2 | +365 | A3 | +365 | A4 | -1332 |

F1 | 88.00 Hz | C1 | +512 | A4 | +512 | A1 | -1184 |

Gb1 | 96.21 Hz | C2 | +668 | B1 | -1030 | ||

G1 | 104.76 Hz | C3 | +815 | B2 | -881 | ||

H1 | 113.14 Hz | C4 | +948 | B3 | -748 | ||

Jb1 | 123.20 Hz | C5 | +1096 | B4 | -602 | ||

J1 | 134.69 Hz | B5 | -448 | ||||

A2 | 146.67 Hz | A2 | -298 | ||||

Bb2 | 158.40 Hz | C1 | -166 | ||||

B2 | 174.60 Hz | C2 | +2 | ||||

C2 | 188.57 Hz | C3 | +135 | ||||

Db2 | 203.66 Hz | C4 | +268 | ||||

D2 | 224.49 Hz | C5 | +439 |