MSP; "A Primer on Compression" - Peabody Computer Music

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Tutorial 6Special EffectsExpansionThe C6b. Microsounds patcher has one more trick. The ratio can be set below 1:1. Fractionalratios give expansion, where soft sounds are made softer. This can restore tracks that havebeen over compressed, or separate out the loudest sounds in a pattern.DuckingSometimes you use one sound to control the loudness of another. An example would be theautomatic ducking you hear on talk radio. The caller alone sounds loud and clear, but as soonas the host speaks, the caller is turned down. This can be done using the patcher C6c.Ducking. It’s just like the previous patcher, but with the control level again subtracted fromthe threshold. The action of the patch is reversed, with the signal getting through the left onlyon the lack of control. Again, the ratio affects the amount of gain change and the thresholdsets the trip point.Controlling FeedbackDelayed feedback is one of the most common <strong>MSP</strong> tricks, but we all know how hard it can beto keep the echoes from building up and overwhelming everything. If you add a omx.comp~object in the feedback path, as shown in the C6d. Feedback patcher, you can forget about thelevels and concentrate on getting the rhythm right. Compressing and gating have a lot tooffer looping patches too.This is just the tip of the compression iceberg. Most engineers practice and experiment withcompressors throughout their careers, and develop a wide repertoire of tricks. Compressioncan add impact to sound effects like thunder and breaking glass, make a sleepy announcersound lively, and balance the backup singers in a band. Many groups and producers owetheir “signature sound” to some magic compression setting, and it helps transmit the voicesof operatic tenors safely over television. In short, compression is one of the fundamental toolsof modern audio technology.22
IndexAGC, 3attack time, 4automatic gain control, 3companding, 4compressionbroadcast-type, 9multiband, 17dual-band compressiondual-band, 10dB parameter conversion, 12Dynamic compression, 3intermodulation distortion, 6, 11limiter, 3limitingbroadcast-type, 9mastering, 19average amplitudeaverage amplitude, 5peak amplitudepeak amplitude, 5RMSRMS, 5Multiband compressors, 3noise gate, 3OMS object parametersparameter scaling, 12oms.peaklim~response times, 8OMX object parameters, 12omx.4band~ object, 17features, 19omx.5band~ object, 20features, 20omx.comp~ objectattack adjustment, 9gain meteringgain metering, 13gain smoothinggain smoothing, 10omx.comp~ object, 9compression parameters, 11radio adjustment, 9omx.comp~ object parameterschannelCoupling, 11Delay, 11freezeLevel, 11gatingLevel, 11LimEnabled, 12Noise Gate, 11progressiveRelease, 11Sidechain, 11SmoothGain, 11omx.peaklim~ object, 7parameter lists, 12pumping, 10ratio value conversion, 12release time, 4compressor response time, 4duckingducking, 22expansionexpansion, 22feedback controlfeedback control, 22keyingkeying, 21microsoundsmicrosounds, 22spectral balancing, 1723
Page 1: MSPA Prime
Page 7 and 8: IntroductionWhat isCompression?limi
Page 9: Tutorial 1Peak LimitingFigure 2 sho
Page 13 and 14: Tutorial 3: Tweaking CompressionThe
Page 15 and 16: Tutorial 3Tweaking Compression• R
Page 17 and 18: Tutorial 4Compression on Real Instr
Page 19: Tutorial 5: Multiband CompressionIt
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MSP; "A Primer on Compression" - Peabody Computer Music

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