Android Question Asking for advice for building a guitar app

1. HorizontalScrollView or CLV or B4XCanvas. Implementing draw and drop is possible but not trivial.

2. It depends on how CPU intensive the task. If you can do it with a timer in a short time then no reason to make things more complicated. If not then you will need to use the Threading library.

Thank you Erel! I tried CLVDragger and found it supports drag and drop. I will try the Threading library for audio.

There is no need for more than one thread to combine a lot of audio-events to a single stereo signal. You create a SHORT()-Array like a ringbuffer and fill in the sounds. Adding sounds to a stream is really only "adding". Combine audios only by addition all their samples one by one. When this work is done, convert all to a BYTE()-Array and send it to the B4A-build in-AudioStreamer.

Have a look on my current project here to see, what is possible: 20tracks-mpx-player

you can also have a look on a chord-playing App I did some years ago: PlayStore.Midimaster.Duett

Thanks Midimaster. I will check that and see how Erel makes audio streaming. I do need dynamically update tempo hence to mix sounds during plackback and also want to put chorus and delay effects in. Glad to know music/audio related app maker.?