Analogue-sequencer

Hi;

Can the P3  sed syx/ex via the aux?  I want to control some parameters like 
decay for the FM old yamaha synths.

What controls exactly the lenght parameter? I want to understand that it is 
the decay control, but I am not sure since it is different on each synth.

What is the default lenght number  0 or 4?

Is any way to turn a row to the default other than turning by hand them to 
the left?

Thanks,

Hans

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