WinXP Pro SP3
Pd version 0.42-5
17-Jan-07 version of PortMidi
hey everyone,
I've been working with PD vanilla 0.42-5 - PortMidi midiout last night, trying to figure out why it wouldn't work with my AKAI MPD 24 properly. Here's what I found:
Patch (as attached:)
240, 71, 0, 104, 49, 0, 11, 8, 0, 0, 72, 97, 108, 108, 111, 32, 32, 32, 247
|
midiout
And to check the results, i used: midiout -> Midiyoke -> MidiOX (all latest versions)
Problem
The message I sent (which was a valid MPD 24 SysEx message, double-checked several times from MidiOX directly) was DEC
240, 71, 0, 104, 49, 0, 11, 8, 0, 0, 72, 97, 108, 108, 111, 32, 32, 32, 247
and should convert have converted to HEX
F0 47 00 68 31 00 0B 08 00 00 48 61 6C 6C 6F 20 20 20 F7
instead, it comes out HEX
F0 47 00 68 31 00 02 08 00 00 52 61 6C 6C 1B 20 20 20 F7
- with 3 wrong HEX pairs.
What happens
I looked a bit at the first number, DEC 11 that should come out HEX 0B but comes out HEX 02
here's how it behaves in reverse engineering:
when i send DEC 0, 1, 2 or 3, it comes out HEX 0
when i send DEC 4, 5 6 or 7, it comes out HEX 1
see table:
DEC .. DEC -> HEX
00 .. 03 -> 00
04 .. 07 -> 01
08 .. 11 -> 02
12 .. 15 -> 03
16 .. 19 -> 04
20 .. 23 -> 05
24 .. 27 -> 06
28 .. 31 -> 07
32 .. 35 -> 08
36 .. 39 -> 09
40 .. 43 -> 0A
44 .. -> 0B
etc.
When you look at the BIN, it becomes obvious what's happening:
DEC (BIN) .. DEC (BIN) -> HEX (BIN)
00 ( 0) .. 03 ( 11) -> 00 ( 0)
04 ( 100) .. 07 ( 111) -> 01 ( 1)
08 ( 1000) .. 11 ( 1011) -> 02 ( 10)
12 ( 1100) .. 15 ( 1111) -> 03 ( 11)
16 (10000) .. 19 (10011) -> 04 ( 100)
20 (10100) .. 23 (10111) -> 05 ( 101)
.. two bits at the end are truncated.
It wouldn't surprise me if we found them somewhere in the other 'wrong numbers' ofthe original message.
When I manipulate the numbers to come out correctly in MidiOX, my MPD 24 will happily accept the sysex and execute it so the probelm is definitely not MidiOx or Midiyoke.
Questions
- can anyone confirm this?
- is anyone currently maintaining PortMidi, so this could maybe get fixed?
thanks
groovelastig
http://www.pdpatchrepo.info/hurleur/sysex-conversion_vanilla.pd