Prueba son iguales

1-----
<quality>3</quality>
<samplerate>8000</samplerate>
<channels>2</channels>
<nominal-bitrate>24000</nominal-bitrate>
<minimal-bitrate>24000</minimal-bitrate>
<maximum-bitrate>24000</maximum-bitrate>
-----

2----
<quality>3</quality>
<samplerate>8000</samplerate>
<channels>1</channels>
<managed>1</managed>
<nominal-bitrate></nominal-bitrate>
<minimum-bitrate></minimum-bitrate>

3-----

    <quality>1</quality>
    <nominal-bitrate>65536</nominal-bitrate>
    <maximum-bitrate>131072</maximum-bitrate>
    <minimum-bitrate>1</minimum-bitrate>
    <managed>0</managed>
    <samplerate>24000</samplerate>
    <channels>2</channels>