Thanks, but my question was not about how to side-chain in general - I know very well how to do that (thank you).
Neither of the tutorials you link to show how to specify which input of the side-chained bus/FX plugin you want to send to.
They just show how to do basic side-chaining.
So why does the Dynamics manual specify inputs "3+4" if these are non-specifiable in DAWS such as Logic and Studio One?
(recognising that it appears to be possible to to this in Ableton LIVE - I get that).
"External (External sidechain)
Activate the External button in order to use the sidechain signal as the source for the peak
detection circuit, allowing you to control the dynamics of the input signal with another signal
This function involves routing the desired external sidechain signal to inputs 3-4 of the plugin
In Studio One 2 - When I insert FXpansion Dynamics processors as a channel insert, on a BUS or on an FX channel the following occurs:
1) For the Channel compressor there is no side chain available - I presume that is by design - understood.
2) For the Bus Compressor I can simply use the standard Studio One side-chaining - no "inputs 3+4" to be seen or specified
3) For the Cross Compressor - the same as for the Bus compressor -but still, no need to specify inputs 3+4 anywhere.
4) For the EnvShaper - the GUI refers to a "side-chain" but regardless of how this plugin is inserted (on a channel, a BUS or FX) Studio One does not present a "side-chain" button as it does for the Bus and Cross compressor.
It seems to me that there isn't the facility to specify which channel of an inserted plugin you wish to send to in Logic OR Studio One - Unless you know otherwise and to be honest, it is becoming more of an academic question now!
Further, the manual/layout for EnvShaper refers to a "side-chain" that is not a "side-chain" but actually the INPUT SIGNAL to/for EnvShaper is it not?!
If it IS a true "side-chain" then why does it not appear so in Studio One as it does for Bus Compressor and Cross Compressor?
The implication from reading the EnvShaper manual/GUI is that instead of shaping via the input signal, one can shape the input signal via a side-chain input - but this isn't possible because S1 doesn't provide a side-chain input.
Or at least if it is possible, how do I specify the side-chain input for EnvShaper as implicated in the GUI?
(If this is not in fact a side-chain input but the standard input for the plugin, why is the term "side-chain" used?)