The Unofficial YAMAHA Keyboard Resource Site
Translate ►
OTS Section Format
OTS Editor software program.
In a hexadecimal editor the beginning of the OTS section might look like this:
The OTS chunk identifier "OTSc" and then 4 bytes giving the length of the entire section, not including the 4 identifier bytes and the 4 length bytes.
Next comes a "MTrk" identifier. This is a MIDI track identifier; and later on will follow 3 more "MTrk" identifiers.
The first MIDI Track holds the "OTS 1" information; the second MIDI Track holds the "OTS 2" information; and so on.
This means that the entire OTS section is so to speak a "4 Track MIDI File with an abnormal header".
In the MIDI Tracks we will find some "normal" MIDI events and a lot of "normal" SysEx messages defining the voices in the OTS set-up.
These "normalities" are found in the keyboard data sheet. SysEx of this form: "F0 43 10 4C xx xx xx yy F7" are normal.
After stripping a OTS section for these "normalities" there will remain some OTS specific data, which all are SysEx messages.
These messages have this form: "F0 43 73 01 5z xx xx xx yy .. yy F7", where
• "z" is 0 or 1
• "xx xx xx" is address. The second xx block is 00 -> 03 = channel (1 -> 4) - Right 1; Right 2; Right 3 and Left.
• "yy .. yy" are actual data value - one or more bytes
The information in this page is not complete; and errors might occur.
Yamaha never tells us about their file formats!
Please contact me if you have information about the "?" fields in the table.
My Mail Address is in the top menu of this page.
| Section | SysEx message | Data Byte Value(s) | Function |
| Header | F0 43 73 01 50 05 01 01 2A F7 | ? | |
| F0 43 73 01 50 05 01 02 32 F7 | ? | ||
| Part Right 1 | F0 43 73 01 50 08 00 00 yy F7 | 00 = 0 or 7F = 127 | part off/on |
| F0 43 73 01 50 08 00 04 yy F7 | 00 = 0 to 7F = 127 | voice set volume *) | |
| F0 43 73 01 50 08 00 03 yy F7 | See table below | Octave Set *) | |
| Part Right 2 | F0 43 73 01 50 08 01 00 yy F7 | 00 = 0 or 7F = 127 | part off/on |
| F0 43 73 01 50 08 01 04 yy F7 | 00 = 0 to 7F = 127 | voice set volume *) | |
| F0 43 73 01 50 08 01 03 yy F7 | See table below | Octave set *) | |
| Part Right 3 | F0 43 73 01 50 08 02 00 yy F7 | 00 = 0 or 7F = 127 | part off/on |
| F0 43 73 01 50 08 02 04 yy F7 | 00 = 0 to 7F = 127 | voice set volume *) | |
| F0 43 73 01 50 08 02 03 yy F7 | See table below | Octave set *) | |
| Part Left | F0 43 73 01 50 08 03 00 yy F7 | 00 = 0 or 7F = 127 | part off/on |
| F0 43 73 01 50 08 03 04 yy F7 | 00 = 0 to 7F = 127 | voice set volume *) | |
| F0 43 73 01 50 08 03 03 yy F7 | See table below | Octave set *) | |
| Part Right 1 | F0 43 73 01 51 08 00 11 yy yy yy F7 | Check Manual | DSP Variation Parameter *) |
| F0 43 73 01 50 08 00 08 yy F7 | 00 = 0 or 7F = 127 | DSP off/on | |
| F0 43 73 01 50 08 00 01 yy F7 | 00 = 0 or 7F = 127 | DSP Variation off/on *) | |
| Part Right 2 | F0 43 73 01 51 08 01 11 yy yy yy F7 | Check Manual | DSP Variation Parameter *) |
| F0 43 73 01 50 08 01 08 yy F7 | 00 = 0 or 7F = 127 | DSP off/on | |
| F0 43 73 01 50 08 01 01 yy F7 | 00 = 0 or 7F = 127 | DSP Variation off/on *) | |
| Part Right 3 | F0 43 73 01 51 08 02 11 yy yy yy F7 | Check Manual | DSP Variation Parameter *) |
| F0 43 73 01 50 08 02 08 yy F7 | 00 = 0 or 7F = 127 | DSP off/on | |
| F0 43 73 01 50 08 02 01 yy F7 | 00 = 0 or 7F = 127 | DSP Variation off/on *) | |
| Part Left | F0 43 73 01 51 08 03 11 yy yy yy F7 | Check Manual | DSP Variation Parameter *) |
| F0 43 73 01 50 08 03 08 yy F7 | 00 = 0 or 7F = 127 | DSP off/on | |
| F0 43 73 01 50 08 03 01 yy F7 | 00 = 0 or 7F = 127 | DSP Variation off/on *) | |
| F0 43 73 01 50 08 03 02 yy F7 | 00 = 0 or 7F = 127 | Left Hold off/on *) | |
| Harmony | F0 43 73 01 50 04 00 00 yy F7 | 00 = 0 or F7 = 127 | off/on |
| F0 43 73 01 51 04 00 00 yy yy yy F7 | See table below | type + speed | |
| F0 43 73 01 50 04 00 05 yy F7 | 00 = 0 to 7F = 127 | volume | |
| F0 43 73 01 50 04 00 02 yy F7 | See table below | assign | |
| F0 43 73 01 50 04 00 03 yy F7 | 00 = 0 or FF = 255 | ch note off/on | |
| F0 43 73 01 50 04 00 04 yy F7 | 00 = 0 to 7F = 127 | touch limit | |
| Multi Pad | F0 43 73 01 51 07 00 00 yy yy yy F7 | Find Values | number |
| F0 43 73 01 50 07 00 00 yy F7 | 00 = 0 to 7F = 127 | volume | |
| Manufacturer Specific message (format unknown) | 260 Bytes | ? | |
| Octave Value | Harmony Data | ||
|
3E = -2
3F = -1 40 = 0 41 = 1 42 = 2 |
Types
Standard Duet = 0 Standard Trio = 1 Full Chord = 2 Rock Duet = 0 + 256 Country Duet = 0 + 256 * 2 Country Trio =1 + 256 Block = 3 4-Way Close1 = 4 4-Way Close2 = 4 + 256 4-Way Open = 5 1+5 = 6 Octave = 7 Strum = 8 Multi Assign = 9 Echo = 10 Tremolo = 11 Trill = 12 |
Speed Values
Echo type: 4, 6, 8 and 12 Tremolo and Trill types: 8, 12, 16 and 32 Type + Speed Data Bytes Byte 1 = always 2 Echo, Tremolo and Trill types: Byte 2 = type Byte 3 = speed index (0 to 3) Other Harmony types: Byte 2 = type%256 Byte 3 = type/256 If byte 2 and byte 3 = 0A 00 Type = Echo Speed = 4 (index 0) |
Assign
Auto = 16 Multi = 17 R1 = 0 R2 = 1 R3 = 2 |
In PSR A3000; PSR S970; PSR S770 and PSR S670 there has been added 166 additional Harmony/Arpeggio types.
These has been added to the OTS Editor software from version 2.37.
Tip of the Day
Looking for sheet music
The internet holds a lot of sheet music. Check out the Fakebooks-Sheets page.
However it might be hard to find a particular sheet in a fake book containing hundreds of songs.
A helping hand is below the 'Fakebook Indexes and Search' heading at the page.
Software of the Day
Style MFD Extract
Extracts song titles and corresponding style numbers from Music Finder data files.
More at the Style MFD Extract Home Page.
© 1999-2025 Jørgen Sørensen
This site does not use cookies; but Google may use non-personal information to provide relevant ads.
I hereby expressly disclaim any liability for the content in and the legality of externally linked sites and pages.
All information is presented 'as-is' meaning: No warranties whatsoever for correctness; completeness or usefulness.
All my downloads are free of adware, spyware, virus, toolbars, etc. Check at McAfee SiteAdvisor or at VirusTotal.
If you find the information at this page useful, you can mail me a 'Thank You' or send me a donation.