Hi, sorry for being quite vague with my questions,
the first question was more of a hardware question where if i didn't have a 3.5mm to 6.5mm jack adapter but i could just use one instead of the common guitar cables.
for the second reply I was having practice with FM synth patch on the bela website but I also did some research online and tried to create my own. (Ill send my patch over when I log into to my PC). But, generally, what I'm trying to achieve is get signal/waveform from a guitar, apply FM synthesis, adjust some of the tones to create multiple sounds using potentiometers and output it to a speaker.
for the potentiometers I wanted to adjust the parameters for pitch, volume and depth and possibly the amount of synthesis applied (in case the original sounds are wanted) for example which is what i meant by adjust the sound input. (which I realised before you messaged, could be achieved using the sliders on pure data and using the adc~ for the potentiometers to adjust the sliders).
giuliomoro