It may also be a bit more complicated to implement.
In analog audio systems, VU meters are used to measure the volume or level of the audio signal. The acceptable VU meter reading for analog audio systems is typically 0 VU, which corresponds to an average signal level of -20 dBFS (decibels below full scale).
For digital audio systems, the acceptable VU meter readings vary depending on the specific system and standard being used. In general, digital audio systems use peak meters or true peak meters to measure the maximum level of the audio signal, rather than VU meters. The acceptable peak meter readings for digital audio systems are often defined based on the bit depth and sample rate of the audio system.
For example, in a 16-bit audio system with a maximum peak level of 0 dBFS, the acceptable peak meter reading would be 0 dBFS. However, in a 24-bit audio system, where the dynamic range is greater, the acceptable peak meter reading might be -3 dBFS or lower.