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Old 18th January 2008
Lives for gear

I would wonder if this could be done with passive transformers. A typical DI box does the opposite of what you want - reduces the instrument level down to mic level. If the transformer was wired backwards, it should be able to step the signal up, and also do the balancing & isolation you need.

If you could find the right transformers this could be a very simple DIY job (or easy to find someone to put together for you).

Transformers should be cheap & quiet, and generally benefit a synth sound.