Occasional video tutorials showing how I use Koala Sampler (iOS and Android) I use an iPad but works the same on smartphones. The most intuitive and fun sampler I use. You do not have to use Koala Sampler. It costs $5-7 USD, one time. Free options: Dawnbeat, Bandlab. About Bandlab. Many people use this platform and I get it. It is a freemium social media platform + full digital audio workstation (DAW). Mastering is free. I dislike it, distracting, free version is impossible because ads.