Re-build of existing web based piano APP

www.numbiano.com

Developer required to rebuild the above site in a more modern framework (for example, React or Vue). We have a few requirements that need to be met by the rebuild:

Latency between tapping a note and hearing the sound must be as low as possible. On some phones latency can be quite high. Sites such as this one (https://musiclab.chromeexperiments.com/Shared-Piano/) seem to work much better, with lower latency, which shows this must be possible.

A pleasing sound which is audible at all frequencies. This could be a sampled sound (e.g. piano), or just a synthesized sound (like the current Numbiano site above). There must be no 'clicking' sounds between each different pitch.

The user should be able to swipe across the notes, on a touchscreen or with a mouse, and all these notes will play (on the current site this works on a mouse but not touchscreen). Again, the Google Chrome experiment seems to do this well.

Numbiano must work on devices that have both mouse and touch input (e.g. laptop with touchscreen). Again the Google Chrome experiment does this well.

The rebuild must have a landing page that welcomes the user, redirects the user to any one of the 12 Numbiano layouts and has a help button that links to a separate website.

Please note that due to this needing to work well on various devices (phone/tablet/laptop etc) the testing phase for this maybe slightly longer than usual, so please do cost this into any estimates of time.