Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 32)

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6.3.4. Back face.
There are 2 items of note on the back face of the unit. Both are located, in
a recess, towards the right side. Nearest to the back right corner, in a
square shaped housing, is the USB cable connector. Just to the left of it is
a small round hole (DC input terminal) which is the socket to take the AC
power supply.
6.3.5. Right side.
On the right side of the unit there are 4 switches as follows:
In the recess nearest to the back , is the Power On/Off switch. Pushing the
switch towards the rear of the unit turns it on and pulling it towards the
front will turn it off.
In the recess towards the front of the unit, from back to front, are the
Speed control, the Tone control and the Recording Level control switches.
All these switches can be adjusted by flicking the switch towards the rear
of the unit to increase the setting and towards the front of the unit to
decrease the setting. The speed and tone settings can quickly be reset to
their default position by pressing the switch inwards. Pressing the
Recording Level switch inwards allows you to switch the Auto Gain
Control On or Off.