TAS5414C-Q1: TAS5414C-Q1: slave can't R/W

# Issue: I can't R/W the SLAVE AMP (only used salve2). But MASTER R/W reg. are OK (except reg. 0x0A can't set to 0x40).

# My initial sequence:

1. Read from master register 0x00 => value = 0x00
2. Read from master register 0x01 => value = 0x00
3. Write to master in the register 0x0A 0x40
4. Read from master register 0x0A => value = 0x00 <== can't write
5. Write to master in the register 0x0B 0xC0
6. Read from master register 0x0B => value = 0xC0
7. Read from slave register 0x00 => value = 0xdd <== get wrong value
8. Read from slave register 0x01 => value = 0xdd <== get wrong value
9. Write to slave in the register 0x0B 0x10
10. Read from slave register 0x0B => value = 0xdd <== get wrong value
11. Write to master in the register 0x0C 0x10 <= set to mute mode
12. Read from master register 0x0C => value = 0x10
13. Read from master register 0x06 => value = 0x0F <== ???
14. Write to master in the register 0x0C 0x00 <= set to play mode
15. Read from master register 0x0C => value = 0x00
16. Read from master register 0x06 => value = 0x0F
17. OSC_SYNC pin => 4MHz <== ???

# that's right? 

Thank you.