This app was mentioned in 6 comments, with an average of 1.83 upvotes
I'd use AOSP or something like it on my phone but god dammit, I love the extra functionality Samsung put in there. I use the S Pen and all the other apps and gadgets daily. Also, Soundcamp. Fuckin' love that.
there was an app made specifically for the note 4 called soundcamp. it only works on samsung devices equipped with the professional audio SDK. no idea if anything there can be used with stock android, but i figured it was worth mentioning.
https://play.google.com/store/apps/details?id=com.sec.musicstudio&hl=en
edjing also has a creation app.
The 6p has decent audio latency @ 18ms, though it's still a generation or two from equalling apple's fantastic latency.
Samsung makes Soundcamp, does almost everything that Garageband does.
https://play.google.com/store/apps/details?id=com.sec.musicstudio
Check out Soundcamp by Samsung. I just got it the other day, but I haven't messed around with it enough.
Samsung devices such as the S7, S8 Tab S2 and Tab S3 all have Professional Audio built in and all Android flagship devices getting Android O will also have professional audio so it's really not a limitation of the platform, but a limitation of the device. Audio Latency on my Tab S2 9.7 is very low. As for GarageBand, Samsung has an app called SoundCamp which is very similar to GarageBand. I still think GarageBand is better, but SoundCamp is a close second and has functionality GarageBand doesn't. I also think a lot of those audio apps will eventually come to Android in 2018 and onwards.