as the example at the manual, setting it's amp works like: outs apiano * amp

however values don't follow 0dbfs = 1... an oscili on thair xamp field would! there's any way to replicate with some op-code i don't know of? i really like the 0 .. 1 approach to ampliation, specially after Joaquim  tip on having a global variable driving it, so i adjust to the numbers of instruments playing to limit amp on each one on 0 -> 1

instr 1
      gi0dbfs = p4
endin

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