Alesis QS Series User Manual

Alesis QS Series Keyboards Service Manual V1.00 42 11/19/06
8.00 Appendix C Sys-Ex Implementations
8.10 S6 Sys-Ex
SYSTEM EXCLUSIVE FORMAT 4/15/95
The QS6 MIDI System Exclusive message format is as follows:
F0 System exclusive status
00 00 0E Alesis manufacturer id#
0E QS id#
cc Opcode
dd Data
: :
: :
F7 End-Of-Exclusive
OPCODES:
00-MIDI User Program Dump F0 00 00 0E 0E 00 <program#> <data> F7
<program#>= 0..127 selects individual user programs
<data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used
to transmit each block of 7 QS6 data bytes. If the 7 data bytes are looked at as one 56-bit
word, the format for transmission is eight 7-bit words beginning with the most significant
bit of the first byte, as follows:
SEVEN QS BYTES:
0: A7 A6 A5 A4 A3 A2 A1 A0
1: B7 B6 B5 B4 B3 B2 B1 B0
2: C7 C6 C5 C4 C3 C2 C1 C0
3: D7 D6 D5 D4 D3 D2 D1 D0
4: E7 E6 E5 E4 E3 E2 E1 E0
5: F7 F6 F5 F4 F3 F2 F1 F0
6: G7 G6 G5 G4 G3 G2 G1 G0
TRANSMITTED AS
0: 0 A6 A5 A4 A3 A2 A1 A0
1: 0 B5 B4 B3 B2 B1 B0 A7
2: 0 C4 C3 C2 C1 C0 B7 B6
3: 0 D3 D2 D1 D0 C7 C6 C5
4: 0 E2 E1 E0 D7 D6 D5 D4
5: 0 F1 F0 E7 E6 E5 E4 E3
6: 0 G0 F7 F6 F5 F4 F3 F2
7: 0 G7 G6 G5 G4 G3 G2 G1
There are 400 data bytes sent for a single program dump, which corresponds to 350
bytes of program data. With the header, the total number of bytes transmitted with a

Alesis QS Series Specifications

General

Multitimbral	16 parts
Oscillators	Sample-based
Effects	Reverb, Chorus, Delay, EQ, Distortion
Display	LCD
MIDI	In, Out, Thru
Memory	User Programs
Outputs	Stereo
Weight	11 kg