An arranger is a band that backs you up with the push of one key. Depending on the brand, some bands are lousy and some are great.
zuki
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Live: Korg PA4X/Bose L1 Pro 8/Senn 935

Studio: Korg PA4X/Kawai MP7SE/Tascam DP24SD/Sony C80/AGK 214/ATEM Mini Pro switcher/