CC Whistle app for iPhone and iPad

CC Whistle is a musical instrument app with a lip-whistle tone.
Using a unique hybrid keyboard that can handle portamento and vibrato freely, you can perform just like whistling.
Since it uses a synthetic sound source method, it can handle various sounds with a small footprint of memory.

Features
-Unique hybrid keyboard that can handle portamento and vibrato freely.
-Select from three keyboard sizes: 25, 31, and 37 keys.
-Shiftable keyboard range arbitrarily.
-Up to 2 touches can be handled simultaneously to make simple whistling duet.
-Built-in reverb.
-Built-in pitch tuning mechanism.
-Play along with songs from your music library using the built-in play-along player.
-Changeable gradual color in the screen to your liking.
-Supports dark mode.
-A detailed user guide is built in and ready to go.

Currently, following functions are not supported.
-Inter app linking feature such as Inter-App Audio and AUv
-Recording & playback the performance