5.7V is a bit too much after the regulater, just as 14V is too much before the regulator. Try to put some load on the circuit (and LED + resistor) and see if the voltage on J1 and J2 drops to acceptable values. If not - get a new wallwart.
You can easily leave out the opamp buffer board for testing. Just connect all three outputs via 10k resistors and add a pulldown of 1k-5k from that signal to ground.
Since lemonhorse asked me to take some pics of my AY and I miserably failed to do that so far, here's a little compensation :-) Little mbAY-3-8912 Demo Drums are VSTi, added a some reverb and delay to hide the noise of my soundcard ;-)
Yes, there's good news - the target is reached, the bulk order will happen. At the moment, the prototype boards are being made and will be thouroughly tested. After that, there'll be a "real" sign-up list on the WIKI - stay tuned! ;D
1) dual-gang 500k pots 2) J25 (~9V-11V DC, for connecting to fan). 3) DB25 4) reichelt, conrad. Hey, how cool is that - all of the answers are right here: http://www.midibox.org/dokuwiki/wilba_mb_6582_base_pcb_construction_guide
Aloa Enners und willkommen an Board ;) Das ist eine der schönsten Arten sich vorzustellen! Viel Spass mit Deinem Floorboard und den sicher noch folgenden Midiboxen :D