Audio Send/Receive Release 0.66b1

Rich Kennerly (
Fri, 11 Aug 1995 14:43:15 -0400

Window Users:

There is a new version of CU-SeeMe, 0.66b1, w/ Audio Send and Receive
available on

The primary new feature of this release is Audio Send capability. You can
choose to send in either 32 Kb/Sec Intel DVI or 16 Kb/Sec Delta-Mod with
50 or 100 mSec buffers. Note: There is a horrible UI bug that occurs when
you change audio transmission modes that causes most of the display to not
be re-drawn. The Toolbar and Participant Window need to be re-written to
fix a number of problems (including system resource hogging and performance
problems) but we wanted to release audio send before doing this.

There is a new audio panel, written by Steve Edgar, (who wrote
the original Windows version of CU-SeeMe more than a year ago). It
requires a DLL - IVSLIDER.DLL. Put a copy of this somewhere in your path
(preferably in /windows).

You might notice a re-drawn button for the Microphone. This now indicates
whether a participant will hear audio when you speak (it either looks like
a old-style radio microphone or has a red X through it). And, if you want
to talk to just one participant, you can hit this button to enter "Private-
Talking" mode. The speaker button button determines whether you can hear
audio from that participant.

This version does not support squelch mode. There is a PushToTalk
option that must be selected in this version. Also, we expect to have a
digital gain control for microphone sensitivity in a future release; for
now you'll have to use whatever software came with your sound card to adjust
mic gain.

We recommend using 100 mSec buffers for best performance. If you're
using a slower link (ISDN, or 28.8) you should use Delta-Mod even though
the sound quality is noticable worse; its better than dropouts.

Let us know how things work.

Known Bugs remaining:

The Control Panel for Audio doesn't refresh at all well after you select
an audio compression method or buffer size.

The Participant window takes way too long to redraw, re-draws too often,
and consumes too much system resources. The Toolbar doesn't refresh

There is still a known bug in the receive code that makes pops and clicks
when you start receiving.

-Rich Kennerly - PC Windows CU-SeeMe developer. <>