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Chapter 8. Dr:rex -- Close Up > A Guided Tour of Dr:rex - Pg. 180

A FILTER EXERCISE The following is a filter exercise that should start a few ideas brewing. Before you begin, start a new Reason song, and create an instance of reMix and Dr:rex. 1. Load a REX loop with a lot of kick drum in it. For example, choose something from the House folder. After loading the REX loop into Dr:rex, click on the Preview button so you can listen and edit at the same time. Select the LP 12 Filter mode and adjust the Frequency Filter slider to a numeric value of 25 and the Resonance to about 75. This should produce a very low end, bass-heavy sound. Raise the Filter Envelope's Amount slider to about 50. This should start to change the timbre of the sound immediately. Now, try working with a different combination of Filter Envelope parameters. For example, to create a percussive loop, have the Attack, Decay, and Release set to 0. Then move the Sustain slider up and down until you reach a desired effect. Click on the Preview button to stop playing the loop. To make this loop appear in the Reason sequencer, click on the To Track button. The corresponding MIDI notes should appear in the Dr:rex track. Click on Play in the Reason sequencer to hear your loop. 2. 3. 4. 5. The LFO (Low Frequency Oscillator) Directly beneath Dr:rex's filter you will find the LFO, or Low Frequency Oscillator (see Figure 8.15). Figure 8.15 The Dr:rex Low Frequency Oscillator can be used to alter different Dr:rex parameters. An LFO is capable of generating waveforms with a low frequency, hence the name LFO. An LFO's purpose is to modulate a parameter, such as a filter or another oscillator. That means that the LFO itself is never actually heard, just its effect on other synth parameters.