System overview
EST3 Installation and Service Manual 1.41
Message and tone storage
The prerecorded messages and tone sequences are stored in a
digital format in the 3-ASU Audio Source Unit internal memory.
When the message and tone library exceeds two minutes in total
length, a 3-ASUMX/32 Expansion Memory card must be
installed in the 3-ASU. The 3-ASUXM/32 provides additional
storage space for up to 32 minutes of messages.
Messages and tone sequences are created and downloaded
directly into the Audio Source Unit using the SDU and a
computer equipped with a compatible sound card.