Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 66)

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To decrease the guide volume, press and hold down the Information key
and then press the Volume Down key repeatedly until you reach the
desired level.
NOTE: When adjusting the guide volume, PLEXTALK behaves in the same
way if it is playing or not playing except that playback is temporarily
stopped as you make your adjustments.
11.5. Changing the playback speed.
REMINDER: The Speed Control switch is the rear most switch, of the 3
switches in the recess at the front of the right side of PLEXTALK.
There are 11 speed settings ranging from -2 to +8, which can be adjusted
1 level at a time. Normal speed is at the 0 position. -2 is half of normal
speed, +4 is double speed and +8 is triple speed.
To increase the playback speed, flick the Speed Control switch towards
the rear of PLEXTALK. The guide will announce the setting you have
selected, for example "Speed +2". If PLEXTALK is playing, playback will be
temporarily halted as you make your adjustments.
To decrease the playback speed, flick the Speed Control switch towards
the front of PLEXTALK. The guide will announce the setting you have
selected, for example "Speed -1". If PLEXTALK is playing, playback will be
temporarily halted as you make your adjustments.
To quickly set PLEXTALK back to the normal speed position, regardless of
where the setting is currently, press the Speed Control switch inwards,
towards the body of PLEXTALK. The guide speech will confirm that the
setting has been changed back to the normal speed position.
NOTE: Each time you make an adjustment, a beep will be heard. A higher
pitched beep indicates the top or bottom of the available range and a
lower pitched beep indicates the normal speed position.
NOTE: Pressing and holding the switch towards the front or rear of
PLEXTALK, will cause the speed setting to change rapidly in the relevant
direction. This saves you having to repeatedly flick the switch .