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FBT M12X4 preamp-mixer problems

Hi everyone. I recently found a used FBT M12X4 preamp unit and apparently there is a problem with one of the 2 channels (tested in every input).
I have experience on repairing stuff but i can’t find any schematic or service manual online.
Does anyone have the schematic for that unit or any idea of any similar fbt device.

Integration of Ferrofish Pulse 16 to Patchbay

Hi, I'm Jonathan. I've been reading through the many posts regarding patchbay's, however I've not found the answer's I think I need.

I'm wanting to integrate a Ferrofish Pulse 16 AD/DA converter to a new patchbay in my rack pictured above. The interface I'm using is the USB Digiface.

SpectraLayers - new versions of old songs

I thought some might find this interesting. I've been using SpectraLayers for a while now, and I thought it might be fun to see if you could strip out the vocals from well known songs, and then do a totally new version of the song, and put back the original vocal. I can't stick this on youtube for obvious reasons, so it's sitting on my server at the moment.

Hard disc recorder that works with old mackie analog board

I have a 1995 Mackie 24.8  8 bus mixer, I'm tired of my DA88 tapes being chewed up and paying Tascam over $300 for repair, so can anyone recommend a 24 track hard disc recorder that will interact with the old Mackie board and hookup to it?  Someone mentioned the Alesis hd24 BUT a mix review on that said" the HD24 does not allow multiple track takes"  what does that really mean?

Beyerdynamic DT 990 Pro 250 ohm Review: A Critical Ear’s Companion Best Headphones for Mixing

In the quest for the ultimate sound experience, especially for tasks as crucial as mixing and mastering, one often encounters a myriad of choices. The Beyerdynamic DT 990 Pro headphones stand out as a notable contender among studio-grade headphones.

Bass on grand piano

Lately I’ve been experimenting with a 2 piece band.  Grand piano/drums/vocals.

I’m using a Shure beta 52 over the piano bass strings heavily lowpassed at 200Hz and sidechain gated to one of 2 contact mics attached to the underside of the soundboard. I’m using C-Ducers.   They give me rich sound.  I’m also adding a stereo pair of Behringer C2’s for air.