Roland's Zenology GX synth is free on iOS through 2026, then available with a Roland Cloud subscription or one-time purchase.
https://www.roland.com/global/products/rc_zenology_gx/
The app comes with dozens of PCM woodwind sounds preloaded.
I've found this video useful for programming an expressive subtractive synth sound:
https://youtu.be/eVBCjK4BuNM?si=2846W5SN1dT5uFJA
It's for Zenology Pro and Roland Aerophone but it mostly applies to Zenology GX and WARBL.