The Yamaha B-4DR is an electronic organ featuring three keyboards: two upper manuals with 44 keys each (32 and 37 octaves) and a lower pedal board with 13 keys. The instrument allows for independent voice registration on the upper manual, lower manual, and pedals via dedicated tone levers.
Key features include continuous control over vibrato, reverb, sustain, and expression. The Auto Rhythm Section offers various styles such as March, Waltz, Swing, Jazz, Rock, Rhumba, Bossanova, Samba, and Variation, with controls for start/stop, tempo, and volume.
| Pedal Keys | 13 keys (1 octave) |
|---|---|
| Output Power | 15 Watts (RMS) |
| Power Consumption | 40 Watts |
| Weight | 55kg (121 lbs.) |
There are 5 voices for the upper manual, 3 for the lower manual, and 1 for the pedals.
The rhythm section includes March, Waltz, Swing, Slow Rock, Jazz, Rock, Rhumba, Bossanova, Samba, and Variation.