When a particular sound lights a creative spark, quickly record it and improvise your idea using Efflux, a browser based music maker recently improved with a more intuitive jam mode and sample slicer algorithm.
Efflux requires no download and runs directly in your browser while also supporting tablets and mobile phones, you can access the app here: https://www.igorski.nl/efflux
Efflux is an online music maker that has both a tracker mode for creating complex pattern-based arrangements while also providing a more intuitive jam mode with piano roll and clip launching facilities. Efflux is fully free and fully open source.