Explain the Buchla 256e Please...

Discussing some incredible modules that don't quite fit into the other forum categories.

Moderators: Joe., luketeaford, lisa, Kent

Post Reply
User avatar
drewskee
Wiggling with Experience
Posts: 431
Joined: Wed May 06, 2009 12:33 pm
Location: Swamps of New Jersey

Explain the Buchla 256e Please...

Post by drewskee » Mon Jul 27, 2009 3:37 pm

Ok, so I am no newbie having a two panel custom Serge and a panel of Buchla 200e with the 261 / 281 / 292 / 266...which can do lots of stuff.

I am thinking about a second 200e panel with an additional 261, 206, 256 and possibly a Morph Filter (now that I would have presets via the 206) or the Freq Shifter.

I have read here and there that the 256 does not really do "mixing" or cross fading and I am trying to get the TRUTH on whether you can fully crossfade between CV 1 and CV 2 inputs and/or get equal mix in the center?

If not, can someone splain' how is DOES work so I have some idea of it will do what I'd like...which is to make all sorts of weird composite mod sources using 266 + 218 + second slot of 256 etc, etc.

Thanks!

:help: :dizzy:

User avatar
prscrptn
Super Deluxe Wiggler
Posts: 1889
Joined: Sun Apr 06, 2008 3:15 pm
Location: Chicago, IL USA

Post by prscrptn » Mon Jul 27, 2009 3:53 pm

The 256e is very useful for creating complex control voltages; (see the link below).


http://xfade.com/Buchla/256/


Thanks Chris! :tu:

User avatar
drewskee
Wiggling with Experience
Posts: 431
Joined: Wed May 06, 2009 12:33 pm
Location: Swamps of New Jersey

Post by drewskee » Mon Jul 27, 2009 4:56 pm

Right....thanks! Been there, read that but also have noticed others saying that the mixing/cross fading does not perform as expected...either it does not cancel out fully when at one extreme or the other...or....the mixed voltage of the two inputs did something weird/unexpected (excluding the transfer function etc).

Wish i could articulate better, cannot find the old posts from Yahoo Group etc.

Thanks again!

User avatar
cbm
Eardrill
Posts: 2051
Joined: Thu Dec 04, 2008 10:07 pm
Location: Alameda, California

Post by cbm » Tue Jul 28, 2009 3:17 am

Like most audio crossfaders, the 256e has some sort of fade law. I don't know exactly what it is, but when the select knob is in the 12:00 position, both the input channels are attenuated a little bit, so that the total output doesn't clip. This is what you want for a CV crossfader, IMO, but might not be what you want for a CV mixer.

In practice it hardly ever bothers me that I can't have two sources mix at 100%.
Chris Muir
Personal -http://www.xfade.com
My Jobby -http://www.eardrill.com (Jobby = less than a job, more than a hobby)

User avatar
cbm
Eardrill
Posts: 2051
Joined: Thu Dec 04, 2008 10:07 pm
Location: Alameda, California

Post by cbm » Tue Jul 28, 2009 3:40 am

To elaborate just a bit further, yes you can get either input source, or a crossfade of the two of them. They are equal in the middle.
Chris Muir
Personal -http://www.xfade.com
My Jobby -http://www.eardrill.com (Jobby = less than a job, more than a hobby)

User avatar
xpander
Super Deluxe Wiggler
Posts: 1133
Joined: Tue Dec 30, 2008 6:24 pm
Location: los gatos, california

Post by xpander » Tue Jul 28, 2009 2:18 pm

if you only have one input, does the crossfade knob scale the signal? i'm picking mine up tomorrow so i've been really trying to figure out exactly how it works before i even toy around with it.

User avatar
cbm
Eardrill
Posts: 2051
Joined: Thu Dec 04, 2008 10:07 pm
Location: Alameda, California

Post by cbm » Tue Jul 28, 2009 2:40 pm

Yes. If you put your signal into in 2 (e.g. LFO from cycling section of 281) and your control source into select (e.g. MIDI Mod wheel from control bus from 225e), the 256e will scale your LFO from 0 to full with Mod wheel travel.
Chris Muir
Personal -http://www.xfade.com
My Jobby -http://www.eardrill.com (Jobby = less than a job, more than a hobby)

User avatar
xpander
Super Deluxe Wiggler
Posts: 1133
Joined: Tue Dec 30, 2008 6:24 pm
Location: los gatos, california

Post by xpander » Tue Jul 28, 2009 5:22 pm

excellent- i'm looking forward to much, much more functionality in my system tomorrow.

User avatar
drewskee
Wiggling with Experience
Posts: 431
Joined: Wed May 06, 2009 12:33 pm
Location: Swamps of New Jersey

Post by drewskee » Mon Aug 17, 2009 4:36 pm

cbm wrote:Like most audio crossfaders, the 256e has some sort of fade law. I don't know exactly what it is, but when the select knob is in the 12:00 position, both the input channels are attenuated a little bit, so that the total output doesn't clip. This is what you want for a CV crossfader, IMO, but might not be what you want for a CV mixer.

In practice it hardly ever bothers me that I can't have two sources mix at 100%.
Yeah, that would not be a problem for me either since it is all for creating psychotic cv's anyway...no tonal sounds for me!

Post Reply

Return to “Buchla, EMS & Serge”