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Not sure where to post this question....might be too "newb" for this
forum.

I have a small P.A. system for playing live - a Yamaha Stagepas 300.
It's got six channels. Problem is, channel six only has stereo RCA
inputs (it's intended for a CD deck, minidisc, etc.).

Since I don't use a playback deck, this seems like a waste of a
perfectly good channel (since it has a fader & EQ on it).

I would like to adapt this channel so I can at least use it as a
guitar/mandolin/etc. patch chord input. Only catch is, there is no
gain knob on this channel (it expects a line-level input from a tape
deck, etc.)

I'm assuming I'll need some sort of combination of a D.I. & pre-amp
type box with 1/4" phone inputs, and RCA type outputs.

Does anything like this exist?

I realise I could just buy a small mixer to use as a sub-mixer....but
I'd like to keep things as minimal as possible - keeping in the spirit
of the whole Stagepas as a very small, portable system.