GG's Roland TR-626 mods.doc

June 22, 2019 | Author: paza | Category: Drum Kit, Synthesizer, Pitch (Music), Sound Technology, Musical Instruments
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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 cobination that crashes !"#$1%&. '(rn)it#%** p(t together this wonderf(l ap of e+ery point to point cobination on IC15 which I’+e p(t at the end of the pages. The other patch points on IC5 do neat things with IC15, 1 and itself. A and B are all patch points simply linked linke d together, not to the machine’s circuitry. Good for combining multiple points rather than 2 together. It’d be weird stacking 6 banana acks on top of each other, or impossible if using another patch system. !he resistor bank points" The resistor ban) coes fro two of the -*51 (ltiplexer chips !IC1 and IC1& abo+e it which o(tp(t the indi+id(al dr( so(nds. They are ro(ted straight to resistors and assigned li)e this: #$%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 prograed 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 coe fro which pins on IC1 and IC1 if yo(’d li)e to ro(te additional so(nds !cowbell, tibale’s, tibale’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" 0oething 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 cobination and easy.

0e1el*1olume controls" 0o, here’s an alost 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 sae as it is on the T potentioeter to the points as s(ch: This is how yo(’d wire (p le+el controls for the bass dr( so(nd. The potentioeter  ranges fro (ted in the left position to lo(d and cr(nchy on the +ery right, with noral +ol(e in the +ery center  position. 0horting
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