how about
[Mapping analog-surround-21] device-strings = hw:%f channel-map = front-left,front-right,lfe,lfe paths-output = analog-output-speaker priority = 8 direction = output
how about
[Mapping analog-surround-21] front-right, lfe,lfe output- speaker
device-strings = hw:%f
channel-map = front-left,
paths-output = analog-
priority = 8
direction = output