Mixer

Five Input Mono/Stereo Mixer with Pan and Master Level.
Two optional stereo channels.
Stereo or mono outs. Stereo earphone out.

http://www.blacet.com/MIX3500fp.jpg

• 0 mA +15V
• 0 mA -15V

Available as an assembled Module and as a DIY project.

No info about availability.