Audio clip properties

### 26.2.6 Audio clip properties

The about, channels, bit_depth, samplerate and duration commands find properties of an audio clip.

- about, channels, bit_depth, samplerate and duration each take one argument: A, an audio clip.
- about(A) prints the information pertinent to A (bit depth, number of channels, sample rate, length in samples, duration in seconds, the peak dB level, associated file name) and returns A.
- channels(A) returns the number of channels in A.
- bit_depth(A) returns the number of bits reserved for each sample value (8, 16, or 24) in A.
- samplerate(A) returns the number of samples per second in A.
- length(A) and size(A) both return the length of A in samples.
- duration(A) returns the duration of A in seconds.