Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 65)

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To decrease the playback volume, either press the Volume Down key
repeatedly, decreasing the level by 1 setting for each press of the key, or
press and hold the Volume Down key until the volume reaches the desired
level.
When PLEXTALK is not playing, each time you adjust the volume, it will
beep and speak the volume level selected, for example, "Volume 16". It
will play a higher pitched beep at the top and bottom setting and will play
a lower pitched beep at the middle position, where the volume is set to 10.
If you press and hold down either of the volume keys, you will hear a
series of beeps, to indicate that the volume setting is changing, until you
reach the highest or lowest setting. Again the top and bottom settings
have a higher pitched beep and the middle setting has a lower pitched
beep.
When PLEXTALK is playing, each time you adjust the volume, it will beep
but will not speak the volume setting selected. It will play a higher
pitched beep at the top and bottom setting and will play a lower pitched
beep at the position where the volume is set to 10. If you press and hold
down either of the volume keys, you will hear an initial beep but no
further beeps until PLEXTALK reaches the highest or lowest possible
setting. You will, however hear the playback volume increase or decrease
accordingly.
11.4. Changing the guide volume.
The internal speech generated by the PTR2 is called the guide speech. The
volume of the guide speech can be adjusted, either along with the
playback volume or separately. The guide volume can be set on a scale
from 0 to 20, in increments of 1, with 0 being silent and 20 being the
loudest possible setting.
If you wish the guide volume and playback volume to be adjusted
together, use the procedure detailed in the previous section. The guide
volume will increase and decrease as you adjust the playback volume. If
you wish to set the guide volume independently, do the following:
To increase the guide volume, press and hold down the Information key
and then press the Volume Up key repeatedly until you reach the desired
level.