Lower tunings for guitar, along with tempo and time signature changes!

So I play in a band that uses lower tunings and when I sometimes get ideas out of nowhere, I cant exactly pull out my real guitar and record it so I dont forget. The problem is, I also cant create my ideas on the GarageBand guitars cause it goes no lower than standard E. This is a great app and its very helpful but please make lower tunings accessible for the guitar! ? bass can do it why not guitar? Also, it would be very useful to be given the ability to have multiple tempo changes or time signatures within a song without it affecting the entire project as it currently does. Just an idea though! Thanks :)

6cat6ninja6 about GarageBand, v2.2.2