{ C(sample_format), &type_sample_format, validate_sample_format },
{ C(scratch), &type_string_accum, validate_isreg },
{ C(signal), &type_signal, validate_any },
{ C(sample_format), &type_sample_format, validate_sample_format },
{ C(scratch), &type_string_accum, validate_isreg },
{ C(signal), &type_signal, validate_any },