FL to read the midi in as input (detected as KBD/KNOB) and sent output to the synth. When recording, I have created a midi out in FL to my synth, and armed a track to record the audio from the synth ...
FLStudio the perfect live performance tool.
There is only one thing that'll still be a challange: switching projects/patches on my synths.
Since I mostly use hardware synths, which are all able to switch patches without any delay, it would ...