except that I had no input at all, I tested directly
with
jackmix & qarecord, but without any sucess no input!!!!
sounds like your mixer settings are not right. Try
alsamixer -c X
Select the input to record from, ensure it's capture level is
unmuted and adjust the level.
And ensure JACK is running in full duplex mode via qjackctl.
Hope this helps.
Best regards
ce