A sampled drum sound can get pretty boring. There's even a name for triggering the same sound repeatedly- the machine gun effect. Sometimes you want this, but often, it's preferable to have a sound that responds to velocity and is more expressive.
There are two ways to address this with Impact XT, depending on whether you have multiple samples recorded at different intensities (i.e., softer and harder hits), or only one sample, which then means you have to fake it sounds like it was recorded with different intensities.
Multiple Drum Samples
This is the most common way to create expressive drum parts. Drum sample libraries often include multiple versions of the same drum sound-like soft, medium, and hard hits. The technique we'll describe here works for more than three samples, but limiting it to three is helpful for the sake of illustration.
Impact XT makes it super-simple to take advantage of sounds recorded at different intensities because you can load multiple samples on a single pad. However, note that if a pad already contains a sample and you drag a new sample to a pad, it will replace, not supplement, the existing sample. So, you need to use a different approach.
Drag the first (soft) sample on to an empty pad.
Click the + sign to the lower left of the pad sample's waveform display, navigate to the medium sample, and load it (Fig. 1).
Figure 1: Click on the + sign to load another sample on to a pad.
Click the + sign again, navigate to the hard sample, and load it.
Above the pad's waveform view, you'll now see three numbers-one for each sample. Impact XT splits the velocity range into an equal number of smaller ranges based on the number of drums you've loaded, and automatically assigns the drums to the ranges. 1 is the first sample (soft) you dragged in, 2 is the second (medium) sample, and 3 is the last (hard) sample. Although Impact XT does automatic velocity assignment, you can drag the splitter bar between the numbered sections to vary the velocity ranges (Fig. 2).
Figure 2: The splitter bar between samples can alter the velocity range to which a sample responds.
Now you'll trigger different drum samples, depending on the velocity.
How to Fake Multiple Drum Samples
If you have a single drum sample with a hard hit, then you can use Impact XT's sample start parameter to fake softer hits by changing the sample start time. (Starting sample playback later in the sample cuts off part of the attack, which sounds like a drum that's hit softer.)
Do all the steps above, but keep loading the single, hard hit. This loads multiple versions of the same sample on the same pad, split into different velocities.
Click on the number 1 in the bar above the waveform to select the first sample.
Drag the sample start time further into the sample to create the softest hit (Fig. 3).
Figure 3: Click on the sample start line, and drag right to start sample playback past the initial attack. The readout toward the lower right shows the amount of offset, in samples.
Click on the number 2 in the bar above the waveform to select the second sample.
Move the sample start time halfway between the sample start and the altered sample start time in step 3.
Play the drum at different velocities. Tweak sample start times, and/or velocities, to obtain a smooth change from lower to higher velocities.
But Wait There's More!
Let's add two more elements to emphasize the dynamics. These parameters affect all samples loaded on the pad, and are also effective with pads that have only a single sample.
Figure 4: Assigning velocity to Pitch and Filter Cutoff can enhance dynamics even further.
At the Pitch module, turn up the Velocity to Pitch parameter by around 0.26 semitones (Fig. 4). This raises the pitch slightly when you hit the drum harder, which emulates acoustic drums (the initial strike raises the tension on the head, which increases pitch slightly, depending on how hard you hit the drum).
Similarly, back off on the Filter Cutoff slightly, and turn up the Filter's Vel parameter a little bit (e.g., 10%). This will make the sound brighter with higher velocities.
Done! Now go forth, and give your music more expressive drum sounds.
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A sampled drum sound can get pretty boring. There's even a name for triggering the same sound repeatedly- the machine gun effect. Sometimes you want this, but often, it's preferable to have a sound that responds to velocity and is more expressive.
