Thanks, the alu-case is from an old modem, but the wood sides are home made, and I’m pretty satisfied. After all I’m more of a software guy 
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I have a love /hate relationship with the Audio injector. The header pins cost me a lot of trouble, as I’ve mentioned elsewhere. But I really like the input part (even though I haven’t been able to turn that on after assembling the case 
) wanna play with the vocoder and maybe some bas/guitar effects.
My power supply is an old laptop psu and a DC/DC converter. Works great for Zynthian, but unfortunately the RPI can’t power my Akai MK25 through usb.
I haven’t thought of a preamp. At home I’m using a bass Amp directly connected to the A-I. I haven’t tried it through a mixer yet, but I guess I’ll go through a line driver if there’s not enough punch in my box.
The jack and fader on top is just a pot and a stereo jack for “private sessions” 
DC/DC converter and a little access window for the SDcard
