[cctalk] Talking PDP11

I have a PDP-11/53 and have just started playing with an AAV11-C D/A board.  It is a 4 channel D/A convertor with 12 bit resolution. Can it be used to play an audio bit stream? Here is simple code used to see if the thing was actually working:     .title AAV11 D/A test     ;     .asect     dbr0 = 170440     .=1000 start:     mov #7777,r0     4096 value to R0     mov #dbr0,r1     first D/A buffer out loop:    mov r0,(r1)    transfer value in r0 to D/A out     dec r0        subtract 1 from D/A value     bne loop     br start        loop back to start I was surprised to see that it took ~34 ms to run through all the numbers from 0-7777, that is about 34 Hz.  The manual says the 'settling time' is 6 microseconds.  Is this fast enough for audio? How would you convert a modern audio file into 12 bit integers? Doug