The blocksize must be <=16384; if the sample rate is <= 48000Hz, the blocksize must be <=4608. Finally, "one of 192/576/1152/2304/4608/256/512/1024/2048/4096" or just (simply) "<=4608", "one of 8192/16384" or just "<=16384"? Maximum (4608) value and any intermediate values are not one of 192/576/1152/2304/4608/256/512/1024/2048/4096. The first statement is more restricted. Is the word "must" to be interpreted as described in RFC 2119 (http://www.ietf.org/rfc/rfc2119.txt)? The second question: