Wednesday, 16 December 2015

Buchla Easel - Program card map for BEMI, Vintage & Rev II 208s

Some maps to help navigate the Buchla Easel program/patch card.
These first 2 pics are for vintage & rev2 versions (not the Rev 1).


1. +15V                                          15. sequencer (out) B ?? (different to tab13F ??)
2. Gnd  (Quiet)                                16. Random out
3. ?  ("rng" on the BEMI card)           17. Envelope trig in
4. ?                                                18. Pulser out A
5. ?                                                19. Env Duration (sustain on the BEMI card) in
6. ?                                                20. Pulser out B
7. Voltage Level - Step 1 (in)             21. Env (in) decay
8. Voltage Level - Step 3 (in)             22. Level (Gate) 1 in
9. Volatge Level - Step 4 (in)             23. MOD osc waveshaper
10. Voltage Level - Step 5 (in)           24. Keyboard in for mod & complex osc
11. n  - sequencer no of steps (in)     25. Level (Gate) 2 in
12. Pulse sequence in.                    26. Envelope Det (CV B)
13. Sequencer CV levels (out)           27. Gate Mode 2?
14. Random (trigger) in.                    28. Inv (Buffer)

On the vintage easel card, the complex osc has marked a "key" and two "WS" waveshaper inputs.
The modern BEMI easel cards names them "Key", "t.lev" (timbre level), and "tws" (timbre wave shapes - tri/sq/saw).
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1. -15V                                 15. key Volt B
2. ?                                       16. pulser trig in
3. ?                                       17. timbre
4. ?                                       18. attack (envelope)
5. ?                                       19. Pressure (Env ??? B)
6. ?                                       20. Envelope Gen (CV B)
7. Voltage Level - Step 2 (in)    21. Seq out (Pulse B)
8. random                              22. Mod osc (Mode) in
9. Period in                            23. Inv  (CV) in
10.index (in)                           24. Complex Osc (WS in) 1
11.frequency (in)                     25. Complex Osc (WS in) 2
12.Sequencer - *Trig in*           26. Gate Mode 1 ?
13.pitch in                              27. SR (Gate out) Offset (EN B)
14.keyboard (pulse B) out        28. SR Gate in (Gate 2 ??)

Modern BEMI cards are 99% the same. They don't have the upper prototyping section
and there is an additional RNG patch point for the mod osc.

The inputs to the "rng" on the BEMI card are 3rd tab, front.
The outputs from the "rng" are tab 27 on the rear of the card (the second last tab).

On the vintage easel card, the complex osc has marked a "key" and two "WS" waveshaper inputs.
The modern BEMI easel cards names them "Key", "t.lev" (timbre level), and "tws" (timbre wave shapes - tri/sq/saw).

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Notes:
++ The trigger point for the sequencer can be either of the bottom two connections
 (below the K or P).
  It corresponds to Tab 12 on the rear card edge connector.
  Looks like the 208 works well with 5V triggers --as tested with my littlebits sequencer.
 http://djjondent.blogspot.com.au/2015/12/buchla-easel-vs-korg-littlebits-and.html

++ Muffs- Easel Mega BOB - Cobramatic

++  Muffs 2 - Easel extension card thing

++ Todd Barton - Easel exploration II
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If there are any errors, omissions or BS, please let me know.
I'll update this page as I sus out all the connections.

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