Buchla Easel Mods?

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seamonkeyman
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Buchla Easel Mods?

Post by seamonkeyman » Fri Mar 24, 2017 9:02 am

Does anyone know of any mods for the BEMI Easel? I was just wondering, as the EMS Synthi/VCS seem to have quite a few mod options, but I've not heard of anyone modding a BEMI Easel, beyond some of the amazing cards people have developed.

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Post by Hiwatt Bob » Fri Mar 24, 2017 9:08 am

My guess is that since the card addresses a great deal of options, so no need to butcher it if you don't need to.
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Post by seamonkeyman » Fri Mar 24, 2017 12:33 pm

I thought that may be the case, guess it beats drilling holes etc. I've always wondered why the arpeggiator didn't latch or have more directions? I was wondering if anyone found a solution to that.

I think I read a thread about using sausage or bacon on the capacitive keyboard as a latch, not tried that myself yet though.... :hmm:

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Post by misa » Fri Mar 24, 2017 2:33 pm

Have you checked out the body contact add on by Joker Nies?

https://soundcloud.com/jokernies/easelweasel-4

it's pretty cool. Don't know if he would make his solutions available. Not really a mod, though, more of a special keyboard..
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Post by papz » Fri Mar 24, 2017 4:49 pm

The first and essential "mod" to do on a BEMI Easel is calibrate it properly. :hihi:
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Post by wsy » Sat Mar 25, 2017 1:22 pm

papz wrote:The first and essential "mod" to do on a BEMI Easel is calibrate it properly. :hihi:
I've looked around for such a doc, but except for a few notes and PMs here and there, I don't know how to set up a 208 properly/.


Anybody have any hints?

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Post by papz » Sat Mar 25, 2017 2:40 pm

You'll find calibration infos on Dave Brown's build page, it's about 208r but should help with a BEMI 208, most trimpots must be the same, maybe some locations are different but you'd be able to understand which one does what with experimentation (if you're not, attempt a calibration by yourself is definitely not a good idea :lol: ).
http://modularsynthesis.com/roman/buchl ... 08spss.htm
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Post by jondent » Sat Mar 25, 2017 4:43 pm

Is one possible mod to get separate outputs for the Modulation & complex oscillators? :hmm:

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Post by ghostcode » Sat Mar 25, 2017 4:56 pm

jondent wrote:Is one possible mod to get separate outputs for the Modulation & complex oscillators? :hmm:
I've thought about something like this. Is there free slots on the edge connector you could send a mult of the oscillator output to?

One thing I've thought about a bit was having the ability to have alternate synths on cards. One example might be braids.

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Post by rayce » Sat Mar 25, 2017 5:34 pm

This is a nice mod for latching the arpegiator or holding notes

viewtopic.php?t=162121&highlight=

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Post by Cobramatic » Sat Mar 25, 2017 7:40 pm

I started a 'wishlist' for mods quite a while back in this thread:
viewtopic.php?t=116678
Some of the items were being worked on - mainly in breakout boxes and card slot devices.
Actually getting the oscillators out separately and a wet / dry seperate out have never yet been done to my knowledge.
Surely must be possible, but I think they are summed together too deeply to make an easy mod possible.

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Post by Don T » Sat Mar 25, 2017 8:19 pm

Cobramatic wrote: Actually getting the oscillators out separately and a wet / dry seperate out have never yet been done to my knowledge.
Surely must be possible, but I think they are summed together too deeply to make an easy mod possible.
Actually, access to those 4 signals would be quite easy. The difficult part would be finding space to put the output jacks, unless you don't mind running them to another panel, or a border strip if the 208 is in a suitcase-type enclosure.

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Post by Peake » Sat Mar 25, 2017 8:40 pm

One thing (beyond adding an Electric Druid noise IC) which would be useful would be to take the Complex Oscillator out into the normal going to the Balanced Modulator so the the oscillators would modulate until an external signal is input.

I've seen at least one mod I believe in DIY of a looping option for the envelope.
This is not the place I'd imagined it to be.

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Post by synthi » Sat Mar 25, 2017 10:57 pm

Peake wrote:One thing (beyond adding an Electric Druid noise IC) which would be useful would be to take the Complex Oscillator out into the normal going to the Balanced Modulator so the the oscillators would modulate until an external signal is input
What a great idea! Do you know where to pickup the complex osc signal? :ripbanana:

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Post by Peake » Sun Mar 26, 2017 1:01 am

Caveat, I didn't see until now this thread is about the BEMI Easel; I've only seen a Roman Easel 2.1 and I have no idea where to tap that signal on it, much less the BEMI...
This is not the place I'd imagined it to be.

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Post by seamonkeyman » Sun Mar 26, 2017 3:06 am

Thanks misa, I couldn't see an ad on the site, sounds good though.

rayce, I think that's the thread with the bacon suggestion I saw a while back, I didn't see it's progression. Maybe I'll try the capactitive film route, as sending my Easel to BEMI for the sustain pedal mod scares me a little given how long it took them to send me some cables a while back... Does anyone know anyone more reliable who can make this mod?


cobramatic
, thanks for sharing that link. Looks like cards are the way ahead for now. In a way I'm surprised, as people mod the pants off EMS stuff, which is at least twice the price of an Easel, but maybe the convenience and 'undo-ability' of the card approach is the explanation.

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Post by papz » Sun Mar 26, 2017 6:42 am

Thanks to their design and assembly, EMS devices are easier to work in and to mod than an Easel, and the BEMI uses a lot of SMT, which doesn't help.
But on the Easel the card slot gives access to almost all parameters, this is thus an obvious way to implement mods keeping the instrument intact without butchering the panel and PCBs.
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Post by flabby » Wed May 24, 2017 4:40 pm

ghostcode wrote:
jondent wrote:Is one possible mod to get separate outputs for the Modulation & complex oscillators? :hmm:
I've thought about something like this. Is there free slots on the edge connector you could send a mult of the oscillator output to?

One thing I've thought about a bit was having the ability to have alternate synths on cards. One example might be braids.
Did anybody do this? Is getting the oscillators direct out possible on the card?
Would be really handy for integrating with a filter and other modules.

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Post by Cobramatic » Wed May 24, 2017 6:39 pm

flabby wrote:
ghostcode wrote:
jondent wrote:Is one possible mod to get separate outputs for the Modulation & complex oscillators? :hmm:
I've thought about something like this. Is there free slots on the edge connector you could send a mult of the oscillator output to?

One thing I've thought about a bit was having the ability to have alternate synths on cards. One example might be braids.
Did anybody do this? Is getting the oscillators direct out possible on the card?
Would be really handy for integrating with a filter and other modules.
You can get the Modulation oscillator raw signal out at the banana on the top right hand side (marked 'Mod cv out'). Obviously it is at a higher level than normal audio but if you use a nana to 3.5mm or tinijax cable, plus an attenuator if required, you can have the audio out before it goes to the LPG2, reverb and mixer.

I don't know of anybody who has managed to get the Complex Oscillator audio signal out separately, but if you use the trick above and add other modules to you setup then you can effectively just use the Easel normal output for the Complex Osc.

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Post by pelican » Sat Feb 24, 2018 6:53 pm

I’ll tell you what would be a cool mod is to add a rechargeable battery and a pair of speakers to make it truly portable
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Post by papz » Sat Feb 24, 2018 7:05 pm

Cobramatic wrote:I don't know of anybody who has managed to get the Complex Oscillator audio signal out separately, but if you use the trick above and add other modules to you setup then you can effectively just use the Easel normal output for the Complex Osc.
I did it on some 208s I built.
I took the CO signal (pre-LPG) on card 8 Molex pin 4 and routed it to a jack or banana socket via a non-inverting amplifier (TL071) to buffer or amplify it if needed.
Not sure the pinout is the same on a BEMI Easel but the signal is easy to track down.
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Post by InnnerSight » Sun Feb 25, 2018 6:05 am

For me it would be really useful to obtain the output from each LPG separately so I could pan them individually.

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Post by papz » Sun Feb 25, 2018 6:36 am

Simply take the signal on the channels A and B level pots.
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I don't offer support of any kind to people attempting to build clones of EMS equipment.

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Post by InnnerSight » Sun Feb 25, 2018 7:38 am

papz wrote:Simply take the signal on the channels A and B level pots.
Is there anyway to do this via the expansion card? - pardon my ignorance in this matter, I'm not much of a DIY'er.

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Post by papz » Sun Feb 25, 2018 8:05 am

It can be done via unused contacts of the program card slot but some extra internal wiring would be needed anyway.
No way to do it with a factory condition unit.
Finest EMS gear service and Music Easel/208 goodies

I'm not a synths dealer and I'm not aware of an inexpensive Synthi secret market, please don't ask me if I know one for sale.
I don't offer support of any kind to people attempting to build clones of EMS equipment.

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