Tascam RC-898 - Manual (Page 45)

Section 7.2 - Unit-related functions
7-7
1) From menu group 2, move the cursor to Sine
Osc. and press SELECT .
2) Use the UP and DOWN keys to select between
off , 440 Hz and 1 kHz .
All other inputs will be overridden by the oscillator
when it is turned on.
S i n e O s c i l l a t o r
M a c h i n e 1
o f f
WARNING
When using the oscillator, turn down the levels of all moni-
toring equipment in the control room and studio to avoid
possible damage to your ears (and speakers, etc.).