I have one question regarding the internal processing of FX Send channels:
Imagine I have set up an external stereo -> stereo effect (amp modeler for example which can model two seperate amp lines for left and right to make the situation clear and transparent). On a stereo channel as an insert it should work perfect. On a mono channel (one clean mono guitar signal) it should not show up as an insert since this is a stereo effect - fair enough.
But I can also set it up as an FX send, which I can feed from a mono channel (mono clean guitar). Since the external effect input is connected as stereo (2 channels), what am I supposed to hear now … my two amp lines left and right since the mono signal is put on left and right channel (copied ??), or just the left amp line or just the right one?
Or to make the question short… how is a mono signal treated on a FX send whose effect usually needs two inputs (left and right) ??