Bands I have been in have managed decent improvement with a 'silent' run through, backstage. Just sticks, guitar & bass not plugged in, acoustic vocals. Although not perfect, a talk through and dry run beats nothing at all....
(Here's one place where a small light arranger with built-in speakers actually DOES work for you!)
[This message has been edited by Diki (edited 01-02-2009).]
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An arranger is just a tool. What matters is what you build with it..!