Problema APO Equalizer con fuente 5.1

En el log veo esto:

2016-12-14 18:50:22.565 5936 71D9E240 (EqualizerAPO.cpp:222): (TRACE) RequestedInputFormat = { 00000003, 1, 4, 32, 48000.000000, 00000004 }
2016-12-14 18:50:22.570 5936 71D9E240 (EqualizerAPO.cpp:234): (TRACE) Output format = { 00000003, 2, 4, 32, 48000.000000, 00000003 }
2016-12-14 18:50:22.575 5936 71D9E240 (EqualizerAPO.cpp:241): (TRACE) Success in IsInputFormatSupported of child apo
2016-12-14 18:50:22.575 5936 71D9E240 (EqualizerAPO.cpp:274): (TRACE) InputFormat not accepted, SupportedInputFormat = { 00000003, 2, 4, 32, 48000.000000, 00000003 }

Un saludo