4CM is narrowest, and 6CM the widest. Facing The facing controls sound flexibility. A long facing makes legato setting easier and improves flexibility. However, this makes it more likely that the sound will lose definition. A short facing provides clear demarcations between sounds.
Flexibility declines, but sound definition is improved.
Yamaha uses a medium length for good flexibility and sound demarcation. Baffle A thick baffle provides muted, subdued sounds. A thin baffle provides bright, er tones. Yamaha baffles are somewhat thin for a rich, vibrant sound. The bank controls the sound and air flow.