I start all song writing processes the same. I come up with a chord progression on acoustic guitar, then figure out some lyrics that fit the groove. Then I double track the acoustic guitar, or a clean electric guitar tone with a basic midi drum groove.
At this point, I start to rely on technology to build the song up layer by layer. I will mess around with the drum midi to create a groove that sounds just right. Technology is starting to shape my song, in that The drum groove that I am able to come up with through midi forms the foundation of the songs emotion. I can't play real drums for much more than standard rock grooves, so midi lets me come up with something a little more interesting than I can pull off on a real kit.
From here I layer in a bass guitar track. I now have a double tracked rhythm guitar, bass guitar, and drum track. The arrangement is sorted out and finalized from start to end of the song with these parts.
Next is the Vocals. I will try several different melodies of the vocals if I have not already sorted one out in my head. When the vocals are tracked from start to finish, I then focus on lead guitar parts.
Developing the lead guitar parts is sort of technology guided as well. An important aspect for me is, the recording needs to be able to be easily translated to real time playing with my band mates. I have to be able to teach them the song, and they have to have the sounds I have recorded in their own sound banks too. So I avoid any crazy guitar or processing effects just to be sure the sound can be replicated properly the next weekend the boys come over to play.
So summary, I guess, is that the song starts as an acoustic idea, but gets developed with technology, but he technology used is governed such that it does not become some sort of electronica show when it comes time to play it live with the band.
Great question. Thanks for making giving the opportunity to think about this.