When making our arrangements, it's of crucial importance we get the sound right. Even though we perform a piece on two guitars, it must keep it's orchestral soul. One must of course have an idea of the sound before one even starts out, but we save a lot of writing-desk time letting computers do some of the work for us. But to get an opinion of the final live sound by listening to MIDI data performed by a cheap synth circuit on a standard sound card, takes more imagination than at least we have
A professional notation software combined with a nice sampled sound is what it takes. But good hardware samplers don't come cheap. So we use this brilliant software sampler called Unity DS-1 instead.