yeah i’m hand building two at the moment using doepfer midi kits and all recycled/reclaimed materials for the enclosure just to keep cost down and because i like that kind of stuff
they’re not super cheap but not outrageously expensive either!
as yet, I have not found or added the perfect cheap buttons but at this stage it looks like i’ll go for mini arcade style buttons using microswitches as they are fairly large, about the same size as the octo trigger buttons with a similar lightly sprung feel, round or square, limited colour range mega reliable.
this one is limited to 8 audio track level 100mm basic aLPS faders with metallized chrome fader caps and 8 buttons simultaneously but ideally you may want 16 or more buttons for mutes of the audio and midi tracks and jamming around without getting to cerebral in front of the OT interface, its possible to add a toggle switch or function button to enable multiple programs
ps… i can do custom builds fo anyone requiring a solid midi controller dedicated for the OT
beautiful dark spotted gum hardwood endcheeks etc… encoders
if i got a few orders that were similar requests i could do a small run of lasercut faceplates/enclosures
to give you an idea of the costs involved, the buttons are between $3 and $10 each, 100mm faders are between $5 and $30 each or go for quality push button encoders $5 each then you need knobs and fader caps $1 - $5 each,
Doepfer 16 input midi kits $150 each, slightly more for digital. they can be daisy chained for more than 16 controller inputs.too… mix & match.
enclosures and faceplates would need to be quoted
as you can see the price starts to add up,
http://au.mouser.com/Search/Refine.aspx?Keyword=alps+100mm
if cost is no factor check out http://www.pennyandgiles.com/Products.aspx
to spark some outrageous controller ideas
in the pic you can see the two midi kits on the left, one analogue and one digital
PM me if you have any interest or ideas!