Like most people, I don’t live in a castle with thick walls, but have to be considerate of the others in the house. Here is my solution for practicing silently:
- Android-Tablet with app “Mobile Sheets Pro” (https://www.zubersoft.com/mobilesheets/)
- Soundfont Synthesizer FluidSynth (https://www.fluidsynth.org/)
- Precision Sounds “Nordic Lowwhistle” Soundfont (https://store.precisionsound.net/shop/nordic-low-whistle/) or their Celtic Whistles (https://store.precisionsound.net/shop/celtic-whistles/)
- My favourite earphones (https://koss.com/products/porta-pro)
- and last but not least my beloved Warble (https://warbl.xyz/)
All links are non-affiliate.
I’m a fifty-something German trad musician building an Irish repertoire on the whistle as a retirement project.
I can read music but I realised learning ITM is much easier without the dot-detour.
If I start working on a tune from dots it takes me much longer to learn it by heart than when I absorb it from ABC notation. The quickest way I’ve come across so far is to learn tunes by color-coded ABC reducing the structure as much as possible. 
