IC# ic point ic15 Resistor Linked together




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Roland TR-626 modification notes

George Gleixner [Crashb65@yahoo.com]



Written May 27, 2009
Patch bay points:

IC# IC point

IC15

Resistor

Linked together


R102a

R113a

R100a

R99a

R98a

R97a

18 - 3

5 - 11

5 - 16

5 - 17

A

B

R102b

R113b

R100b

R99b

R98b

R97b

5 - 18

5 - 19

5 - 28

5 - 29

A

B

1

2

3

4

5

6

7

8

6

6

A

B

9

10

11

12

13

14

15

16

5

5

A

B

17

18

19

20

21

22

23

24

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 combination that crashes (32/16). Burnkit2600 put together this wonderful map of every point to point combination on IC15 which I’ve put at the end of the pages.
The other patch points on IC5 do neat things with IC15, 18 and itself.
A and B are all patch points simply linked together, not to the machine’s circuitry. Good for combining multiple points rather than 2 together. It’d be weird stacking 6 banana jacks on top of each other, or impossible if using another patch system.
The resistor bank points:

The resistor bank comes from two of the 4051 multiplexer chips (IC18 and IC19) above it which output the individual drum sounds. They are routed straight to resistors and assigned like this:






R102………….Snare

R113…….Crash/ride

R100…………..Toms

R99…………….Hats

R98……………..Rim

R97………Bass drum
The top points, when routed through points

27, 5, 6, 7 and 8 (on IC15) replace the individual

Sound with a squarewave synth (different points

are different octaves). The pitch of the synth is altered

With programmed pitch of the individual drum sound.

Putting the sounds through IC5 (11, 16, 29) and IC18 (3)

cause different distortions to that individual sound.

Because I wanted the option of running multiple sounds

through different synth sounds, I added addition patch points for them.

If you’d like you can always figure out which sounds come from which pins on IC18 and IC19 if you’d like to route additional sounds (cowbell, timbale’s, congas, etc…) through synth and distortion patches as well. I use both points of the resistor in the patch bay because the other end of each resistor outputs a higher level of the sound for added volume when routing sounds through the machine. Try running drums through the other patch points too, of course!



Patch control bay:
Something else I added and that’s really worth putting on your machine (especially if you’ve got as big a patch bay as this) is a patch “control bay.” Essentially, the ability to patch points two a switch, button or pot so you can have access to your favorites. It’d be done like this -------------------------------------------------------
This way you can connect a patch you like to both points that are wired to a switch and flip it when you want it engaged. I found it a little difficult to use pots since many will just have a dead zone and on zone and different patches would need different pot values. This is good though for song progressions and being able to easily switch individual drum sounds to synth sounds in combination and easy.

Level/volume controls:
So, here’s an almost necessary mod. Volume controls for individual sounds. It’s one of those features you feel should have been included already…This is done the same as it is on the TR-505. Though the 626 does have individual outs which are good for effects, having to use a mixer just to control would be very overdone with this easy mod.
Using the same resistor bank from above in the patch bay you can add volume controls for each

of the sounds noted in the picture. Simply wire up a 100K potentiometer to the points as such:

This is how you’d wire up level controls

for the bass drum sound. The potentiometer

ranges from muted in the left position

to loud and crunchy on the very right,

with normal volume in the very center

position. Shorting R97 and R105 simply

makes a shortcut to the muted position

on the potentiometer which makes for a

good kill switch for individual sounds.
If you want to make volume controls for other

Sounds that aren’t in the small little collection

Of resistors right there you can always, like I

Said above, figure out which pins are which

Sounds on IC18 and IC19 then follow the circuit

and do the same thing - or simply cut the data line from

the IC pin and add a potentiometer or switch between

the points.


Kit Changes:
These are taken directly from burnkit2600’s IC15 map. These just swap out sounds in the rhythm for another sound (Conga becomes snare drum, etc). I chose to add 8 switches for the 8 burnkit2600 favorites which are:

28,2

29,2

32,2

29,16

30,16

32,28

32,29

32,30


Rhythm fills:
I added 8 switches and buttons for different rhythm “fills.” Basically this scrambles the RAM chip holding the rhythm information, so when you engage a switch you get strange rhythm with different sounds and pitches. The RAM chip is usually avoided, but I’ve found each of these connections to be perfectly stable for fills:
Common point: IC18 pin 8

Pins on IC2: 4, 5, 7, 8, 9, 21, 23, 24
The other pins on IC2 did sometimes cause fills, but would change the programmed rhythm or crash the machine.

Individual squarewave synth outputs:
Very simple but awesome – individual output jacks for the squarewaves available from the 626. Get some audio jacks (I use ¼”) and wire one point to the 626’s ground, and the other to these points:
IC15 pins 27, 5, 6, 7, 8, 9
Each output is a different octave of squarewave, from lowest to highest: 6, 5, 27, 7, 8, and 9.
Additional point to point bends:


Bend points

Description of bend

IC25 pin 5


C71 (above phone jack)

Use a 5k pot and a switch in line to turn this on and off. This is a heavy distortion which also causes some plain noise frequency. Good for distortion synth sounds and nice loud gabber sounds.

IC5 pin 24

IC18 pin 8

Pitch down. Switch is best for this. (Have not tried a pot lower than 1K, but every pot I’ve tried simply has an on/off area. No variable pitch)

IC15 pin 20

IC23 pin 3

Nice fuzzy, crunchy distortion. Makes bass drum sound great too. Not sure if it’s pin 3 or 6 on IC23 since it’s a small chip and isn’t labeled. The one that has C43 connected with it is the one I’m talking about, though 6 does cause a heavier distortion.

IC25 pin 1

IC16 pin 6

Causes the toms/timbale’s to have a sort or tremolo/reverse gate type effect and causes the ride/crash cymbals cutoff time to change and be much longer, almost eradicating the cutoff. Again, not sure if this is pin 3 or 6. Counting from the “IC16” label it’s 6 away.

IC15 pin 5

C39 (above phone jack)

I call it this the auto-bassline mod. Usually the synth sounds you can achieve are really sharp and crisp, this is muddy, warm and deep. It adds a bass synth sound to every sound which varies with instrument pitch. For this you can use a pot or a switch. I used a switch with a 330ohm resistor in place.




Been a bit tied up recently with personal matters but finally got back to business and it is DONE.


[img]http://i32.tinypic.com/ml03yf.png[/img]

[img]http://i28.tinypic.com/106kjuc.png[/img]

[img]http://i27.tinypic.com/2dvofp2.png[/img]

[img]http://i29.tinypic.com/2damvwn.png[/img]

[img]http://i26.tinypic.com/xfrnlg.png[/img]

[img]http://i26.tinypic.com/xfrnlg.png[/img]

[img]http://i30.tinypic.com/f06t88.png[/img]

[img]http://i27.tinypic.com/f1m8so.png[/img]


This thing is, to say in the least, incredible if I may say so myself! When I started making it I wanted to make almost every available useful modification I could find accessible... I did just that. Took lots of money, time and effort but was most definitely worth it! Hope to be performing with it as well sometime.
So, down to detail....Where do I start...

[b]


On the case itself: [/b]

- Heavy full sound distortion/bass generator knob with on off switch

- "Bass line" switch (adds low octave synth tones with lowpass filter effect)

- Bass drum distortion switch

- Pitch down switch

- Switch that adds odd tremolo to congas/toms and reduces cutoff for cymbals


[b]On the panel: [/b]

- Volume knobs and kill switches for bass drum, snare, hihat, toms, crash/ride

- 8 "kit replacement" switches... just replaces drum sounds with other sounds/pitches

- 8 "fill" switches/buttons. Creates odd repeating patterns, snare rolls, different rhythms. This is attached to the RAM chip but I've found these points to be secure.


[b]The monster patch bay[/b]
This may be a lengthy explanation... Okay, first off there are quite a few "sections." 32 points for IC15, 8 points routed again to points 27, 5, 6, 7 and 8 on IC15 (explained in a minute)


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