BASS_ChannelSetPosition doesn't work for tail part (BASS_ATTRIB_TAIL)

[suathd]

I have to add some silence part to end of stream.
I applied BASS_ChannelSetAttribute with BASS_ATTRIB_TAIL.
It works fine.
BASS_ChannelGetPosition works successfully for tail part (silence part) also.

Unfortunatelly, user cannot navigate through silence part.

BASS_ChannelSetPosition doesn't work for silence part.