AMPTone1.par 1000.0 Stimulus carrier frequency (Hz). 200.0 Stimulus modulation frequency (Hz). 50.0 Stimulus percent amplitude modulation. 20.0 Stimulus signal intensity (dB SPL). 10.0e-3 Stimulus signal duration (seconds). 0.1e-3 Stimulus sampling interval, dt (seconds). PTone1.par 1000.0 Stimulus frequency (Hz). -32.0 Stimulus signal intensity (dB SPL). 100.0e-3 Stimulus signal duration (seconds). 0.02e-3 Stimulus sampling interval, dt (seconds).