Descant Recorder The YAMAHA 30 series flutes are designed for beginners. They offer an ideal amount of air resistance for easy control of the sound. Their precise intonation is usually found only in more expensive instruments. Although other plastic recorders look similar, they can not yet keep up with the ABS plastic recorders built by YAMAHA. For the advanced player, the 30 series has made improved breath control and clear tone possible through its angled wind tunnel.