Hi Gusarambula,
Yes, this command can work well.
But I think that there should be another method by tinyalsa.
such as:
tinymix SLIM RX1 MUX:AIF1_PB
tinymix SLIM_0_RX Channels:One
tinymix RX4 MIX1 INP1:RX1
tinymix RX4 Digital Volume:50
tinymix SPK DAC Switch:1
tinymix SLIMBUS_0_RX Audio Mixer MultiMedia1:1
tinyplay xxxx.wav -D 0 -d 0