Roland TR-626 modification notes George Gleixner [
[email protected]] ritten !ay 2"# 2$$% &atch bay 'oints( IC# IC point IC15 Resistor Linked together R102a
R113a
R100a
R99a
R98a
R97a
18 - 3
5 - 11
5 - 16
5 - 17 - 17
A
B
R102
R113
R100
R99
R98
R97
5 - 18
5 - 19
5 - 28
5 - 29
A
B
1
2
3
!
5
6
7
8
6
6
A
B
9
10
11
12
13
1!
15
16
5
5
A
B
17
18
19
20
21
22
23
2!
27
27
A
B
25
26
27
28
29
30
31
32
7
8
A
B
Explanation and reasoning behind patch points: Let’s start with IC15. The big chip right in the center, which is the location of tons of bends and there’s literally only one cobination that crashes !"#$1%&. '(rn)it#%** p(t together this wonderf(l ap of e+ery point to point cobination on IC15 which I’+e p(t at the end of the pages. The other patch points on IC5 do neat things with IC15, 1 and itself. A and B are all patch points simply linked linke d together, not to the machine’s circuitry. Good for combining multiple points rather than 2 together. It’d be weird stacking 6 banana acks on top of each other, or impossible if using another patch system. !he resistor bank points" The resistor ban) coes fro two of the -*51 (ltiplexer chips !IC1 and IC1& abo+e it which o(tp(t the indi+id(al dr( so(nds. They are ro(ted straight to resistors and assigned li)e this: #$%2&&&&.'nare #$$(&&.)rash*ride #$%%&&&&..!oms #++&&&&&.ats #+-&&&&&..#im #+&&&Bass drum The top points, when ro(ted thro(gh points #/, 5, %, / and !on IC15& replace the indi+id(al 0o(nd with a s(arewa+e synth !different points are different octa+es&. The pitch of the synth is altered 2ith prograed pitch of the indi+id(al dr( so(nd. 3(tting the so(nds thro(gh IC5 !11, 1%, #& and IC1 !"& ca(se different distortions to that indi+id(al so(nd. 'eca(se I wanted the option of r(nning (ltiple so(nds thro(gh different synth so(nds, I added addition patch points for the. If yo(’d li)e yo( can always fig(re o(t which so(nds coe fro which pins on IC1 and IC1 if yo(’d li)e to ro(te additional so(nds !cowbell, tibale’s, tibale’s, congas, etc4& thro(gh synth and distortion patches as well. I (se both points of the resistor in the patch bay beca(se the other end of each resistor o(tp(ts a higher le+el of the so(nd for added +ol(e when ro(ting so(nds thro(gh the achine. Try r(nning dr(s thro(gh the other patch points too, of co(rse
/atch control bay" 0oething else I added and that’s really worth p(tting on yo(r achine !especially if yo(’+e got as big a patch bay as this& is a patch 6control bay.7 Essentially, the ability to patch points two a switch, b(tton or pot so yo( can ha+e access to yo(r fa+orites. It’d be done li)e this 8888888888888888888888888888888888888888888888888888888 This way yo( can connect a patch yo( li)e to b oth points that are wired to a switch and flip it when yo( want it engaged. I fo(nd it a little diffic(lt to (se pots since any will 9(st ha+e a dead one and on one and different patches wo(ld need different pot +al(es. This is good tho(gh for song progressions and being able to easily switch indi+id(al dr( so(nds to synth so(nds in cobination and easy.
0e1el*1olume controls" 0o, here’s an alost necessary od. ;ol(e controls for indi+id(al so(nds. It’s one of those feat(res yo( feel sho(ld ha+e been incl(ded already4This is done the sae as it is on the T potentioeter to the points as s(ch: This is how yo(’d wire (p le+el controls for the bass dr( so(nd. The potentioeter ranges fro (ted in the left position to lo(d and cr(nchy on the +ery right, with noral +ol(e in the +ery center position. 0horting
