Could you look at the possibility of a sustain effect similar to the Fernades sustainer pickup, so that you could get full sustain at low volume clean sounds through to full gain driven sounds. Yes I can achieve an effect of long sustain using delay & reverb but the effect is limited and often overpowers the next note played.
regards Rob
SUSTAINER EFFECT
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Is this what you are after? This would be such a powerful and value enhancing addition :