Thank you for your kind input.
Yes, we'll update the app and the FW, as you suggested.
It would take time, but we'll update them step by step once we release the product.
The volume control is one of the most significant design considerations when we make a system. We want to make it simple and easy, but the primary interest of us is sound quality. We need to keep the sound quality without any loss even at a lower volume level in which most users listen to music.
Anyway, we're trying to figure out how to provide both easy UI and sound quality at the same time. Your suggestions might be one of the options, and we'll consider them for further updates.