[1] Hardware from other vendors often used sample rates as high as 8192 Hz, often integer multiples of video clock signal frequencies.
Newer files have a header that consists of six unsigned 32-bit words, an optional information chunk which is always of non-zero size, and then the data (in big-endian format).
Formats 2 through 7 are uncompressed linear PCM, therefore technically lossless (although not necessarily free of quantization error, especially in 8-bit form).
Formats 1 and 27 are μ-law and A-law, respectively, both companding logarithmic representations of PCM, and arguably lossy, as they pack what would otherwise be almost 16 bits of dynamic range into 8 bits of encoded data, even though this is achieved by an altered dynamic response and no data are discarded.
Several of the others (number 8 through 22) are DSP commands or data, designed to be processed by the NeXT Music Kit software.