I've found the second audio on my Topfield box and I've noticed that it's the audio description for certain programs. Is there any way to play both audio streams at the same time?
I can either get the normal dialogue for the programme, or listen to silence for ages until I get told "he walks out of the room closing the door behind him". If you were partially sighted or blind surely you'd need both streams playing at the same time.

Sadly it's not possible; I've enquired about making it possible, but hardware limitations prevent it, according to the engineers.

Nigel.

Exactly - you need them both playing at the same time. It's a pitty the Toppy can't do this but it is good that it is one of the few boxes that can actually receive the audio description.
I suppose you could have a cheap freeview box outputting normal programme sound and combine it with the Toppy playing audio description.
Unless there was a way of getting the second Toppy tuner to output audio description while watching the other tuner as standard but I'm sue if this was possible Nigel would have pointed it out.

Tuners aren't the limiting factor. There appears to be no facility in the hardware for decoding and mixing 2 audio tracks simultaneously.

Couldn't you transfer to PC, demux, mix the two mp2s together in audacity (say), reconvert back to rec, upload back to Toppy?

A lot of faffing I know, but it's an option

Well, I daresay you could, but what would be more desireable is hardware support - there are very few boxes out there that do have the appropriate support right now.

Nigel.