This is an analog of the program for the desktop computer Yamaha THR Editor. This app is completely free and without ads. What you need: - Yamaha THR amplifiers. - Android phone or tablet that supports USB On-The-Go. - USB cable attached to the amplifier. - OTG USB Adapter. Note: This app is not affiliated with or endorsed by Yamaha Corporation in any way. THR is a registered trademark of Yamaha Corporation.