Funnily enough, I believe that a considerable degree of "expressiveness" was one of the last, crucial and enduring contributions by Csound creator Barry Vercoe. In particular, in the tempest opcode, and possibly also the SHARC instrument partial database. Where tempest can be used to track accelerando or retardando for accompaniment. Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"