Add digital output capabilities to Ivory 2 range, VP-1 and M-3

Main Features
- Output formats:
AES/EBU (according to AES3 and IEC60958-4), Coaxial (according to IEC60958-3), Optical (according to IEC60958-3)- Converter type:
AKM 5393VS- Sample rates: 44.1, 48, 88.2 and 96kHz
- Word lengths: 16, 20 and 24 bit
- Input: Unbalanced, greater than 1kohm
- Gain flatness: +/- 0.3dB 20Hz to 20kHz
- Distortion and noise: THD + N better than 95dB for 997Hz -1dB FS output
- Noise: -110dB FS (rms, unweighted) 1 channel mode
- Noise: -107dB FS (rms, unweighted) 2 channel mode
- Spurious discrete spectral components: less than 130dB FS for low level signals
- Jitter modulation: less than 100ps rms
- Internal clock accuracy: +/-10ppm (professional AES 11 spec)
- External sync word clock frequency tolerance: +/-50ppm