My guitar amp simulation software of choice has been BIAS FX 2 on my iPad and it's pretty great, but I'm starting to get the point where I'm outgrowing the iPad for what I want to do, I think. I've bought a selection of BIAS FX 2 stuff on desktop, and it comes with Audio Units plugins that you can use in GarageBand and such. It turns out you can get a 90-day trial of Logic Pro, so I'm giving that a red hot go and we'll see if I can manage to make some sort of song! I recorded some drums yesterday today but my biggest issue there is keeping in time, even with a metronome going. 😛
But today I recorded my first song in Logic Pro, with me playing both guitar and drums! 😁 Granted it's less than a minute long and is pretty repetitive, but whatever. Yay!
Big thanks to @futzle@aus.social for pointing out Logic's "quantize" functionality that will automatically move your slightly-out-of-time notes to be back in time, very helpful for getting a good drum track. The drums were was just recorded straight into Logic then quantized, rather than playing back again with any of the built-in Roland drum controller kits that the drum kit comes with (I haven't even looked into how that's done yet), and the guitar was recorded with one of Positive Grid's "BIAS Pedal" effects.