Re: [Csnd] 0dbfs at score

sweet! i also thought at my walk today about something like this (untested);

0dbfs = 1

instr str dur amp
i1 0 3 [1 / N]

where N is the number of instruments playing

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yes, perhaps you can use the "active" opcode to know the number of instruments playing.
(all is possible in the actual csound code = the instruments, but very few in the score which is actually a list of events and not a programming language.)