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Buchla Tsnm - touch sensing note memory
MUFF WIGGLER Forum Index -> Buchla, EMS & Serge Goto page Previous  1, 2, 3, 4, 5 [all]
Author Buchla Tsnm - touch sensing note memory
cygmu
seeasound wrote:
sensitivity?

That would be to do with the pressure right.


Not just the pressure, but the overall sensitivity of the pads. It is a user-level calibration option -- see the user manual.
seeasound
Hmm yeah imok with that....doesnt solve this dropped note/pulse issue
cygmu
Yesterday I added a freshly built 258 to my case and today I began to notice dropped pulses from the TSNM. I have yet to investigate in depth but I thought it could be worth mentioning.
tarandfeathers
cygmu wrote:
Yesterday I added a freshly built 258 to my case and today I began to notice dropped pulses from the TSNM. I have yet to investigate in depth but I thought it could be worth mentioning.


Can you clarify a little? Is it that the correct CV is generated for correct time for the step in question but no pulse is generated for that step? Or are the steps skipped completely?

Edit: If it's the former, I'm guessing it could be an intermittent timing issue between the two pins that generate the pulse (i.e. the high pin has already switched off before the low pin kicks in). In this case an envelope should still fire if it is sustain mode. Or, it could be a loading issue, or incorrect gain of the pulse adder/amplifier to fire a buchla envelope consistently? The TL072 has built in output short protection so R4 could be reduced or replaced with a jumper to ensure the output is still correct when stacking to multiple inputs. R5 could also be increased in value to bump the overall gain up.

I will have a play with my TSNM and see if I can capture an output pulse that doesn't make it to full level on the short initial pulse before the gate...
jimfowler
Yep, same thing here: intermittent skipped note/pulse. Haven’t looked into it but I’m somewhat consoled to know I’m not alone in this regard.
cygmu
tarandfeathers wrote:

Can you clarify a little? Is it that the correct CV is generated for correct time for the step in question but no pulse is generated for that step? Or are the steps skipped completely?


I think what I heard was just the absence of a pulse, with everything else continuing as normal. I have yet to take a close look at what's happening. Like you I wondered about loading. The timing idea did not occur to me and I have to say I do not really understand what the LOW pin is doing. I guess I will have a look when I get the chance, but at the moment I can't think why you would use two pins to drive the pulse output. Is there a reason? [Edit: after chatting to a friend we believe that the two pins are used to generate a 10V trigger / 5V gate, Buchla style. I will check it out when I get a chance.]

The other thing I am intrigued about is that I had not encountered this before in several hours of usage.
tarandfeathers
Yeah, the low pin is the sustained gate out and the hight pin is the brief pulse, they get summed together and amplified to create the correct buchla shape trigger. Of course this means they both need to be high at the same time. I'm not sure how short the short pulse is yet but potentially there could be situations where the software is held up by an interrupt or something between taking the two outputs high and then by the time it is free it is already taking the high pin low.

Re: loading, there has been some talk about how the different levels of the two stage pulse on the 245/6 do or don't fire a 281 in its various modes so I wonder if the output from the TSNM might be at some marginal level that sometimes just doesn't quite make it? That should be easy to fix with some component value substitution (and is why I asked about whether the envelope being fired was in transient or sustain mode - in either the firmware or hardware explanation I'm suggesting sustain mode should still work)

Of course, it could me a more serious firmware issue where somehow a pulse just isn't generated at all for some reason. I haven't noticed this but haven't used the sequencer or arp that extensively, I will get the pulse out on the scope this weekend and see if I can see the problem and what might be happening...
cygmu
I can't reproduce the missing pulse now. The other day when it was happening, my 258 was not screwed into my case, but just resting in there to be tested as a fresh build. Today I mounted it properly, and since then I can't reproduce the issue.
jimfowler
All of my modules are fitted properly and I'm getting the drop-outs. It's very intermittent but I'll see if I can catch it in the act over the weekend.

- Jim
seeasound
Yeah its intermittent and does not seem to appear until maybe after 15-20 mins of jamming...

I also tested it on a bugbrand system and it did the same thing.

Luckily its only a pulse drop and it holds the timing of the internal clock so its just "variation". The pulse led is also lit for the dropped pulse.
seeasound
ok two other quirks I have with the TSNM

when i record in a sequence with the plates it plays back like an octave or 2 higher then what the original was.

and the portamento knob when its slightly above zero makes the overall pitch go slightly sharp.

Anyone share these behaviours?

Edit: ok the the portamento behaves like this when quantization is set to quarter tones
jimfowler
Does anybody know if this will ever be made available again? Or if there's concrete evidence of another more-Buchla-specific iteration in the works. I've got one and I can only imagine the sheer awesomeness that would be a pair.

- Jim
renny3c
jimfowler wrote:
Does anybody know if this will ever be made available again? Or if there's concrete evidence of another more-Buchla-specific iteration in the works. I've got one and I can only imagine the sheer awesomeness that would be a pair.

- Jim


I've been waiting for almost a year or so for the pcb to be available in modular addict... already bought all the components, just waiting for the PCB and panel!
ArguZ
Rumors have it he will emerge with something new and better.
hox3d
I hope there will be an alternative 4U panel available (not Buchla format).
Revok
hox3d wrote:
I hope there will be an alternative 4U panel available (not Buchla format).

I sent an email in November asking if LW was ever a possibility. I didn't get a reply.
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