Editing a multi-track instrument, such as a multi-microphone drum kit or a full band, requires a little more care than editing a solo performance.When stretching or quantizing multi-track audio, it is critical to maintain the phase relationships of the original recording. This can only be achieved if the tracks are stretched at the same exact points in time across all tracks.AudioSnap provides tools that make it easy to preserve the phase relationship across tracks when editing beats on individual tracks.In the following example, you will learn how to use AudioSnap to edit a multi-track drum kit alongside a piano track. The drum kit was recorded with three microphones (kick, snare, and overhead), each routed to its own track.The following figure shows the last three hits of a song. The top track is piano and the rest are drums: kick, snare and overhead.A. Piano track B. Drum tracksAs you can see, the drummer has rushed and is not in time with the piano. At the beginning of the measure, the drummer is in time with the piano. Over the course of the measure, the drummer is performing a fill and on the next three beats is way ahead of the piano player. You can see how the transient markers on the drum tracks are progressively earlier as the measure goes on (the drummer is rushing).Our job is to align the drum hits with the piano hits so that the drum and piano tracks in time all the way through the measure.
2. Assign the track’s Edit Filter control to Audio Transients.
5. On the AudioSnap palette, set Resolution to 1/16.
7. On the AudioSnap palette, set Threshold to 100% to ensure that there are no transients detected. This step is necessary because the overhead track contains audio from both the kick and the snare, and you want to make sure the kick, snare and overhead tracks are always synchronized when stretching beats.
9. Right-click any selected clip and select Merge and Lock Markers on the pop-up menu.All three drum tracks now share the exact same transient markers, and each clip’s position is locked.Figure 3420. The Merge and Lock Markers command has copied the same transient markers to all three drum tracks.We want to keep the feel of the piano track, so our goal is align the drum tracks with the piano track, while preserving the phase relationship between the three drum tracks.When editing multiple transients to adjust the timing of a performance, often times you need to speed up or slow down a section rather than just move an entire section later or earlier. In this example, the drummer was speeding up through the drum fill and then hits next downbeat too early. To fix this, you need to proportionally drag the drum transients so they are better aligned with the piano track.
11. The selected transients are stretched proportionally. The first and last drum and piano hits are now aligned. The effect of this edit is that the drummer no longer rushes through the fill and he lands on the downbeat much closer with the piano.Figure 3421. The drum and piano hits are aligned.All three drum and piano hits are now aligned properly, and the phase relationships between all drum tracks have been preserved.Figure 3422. All three drum and piano hits are perfectly aligned.For information about maintaining phase relationships without stretching audio, see To quantize multi-tracked drums without stretching audio.
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