Software Round-up: LFO and Tremolo Plugins

Give your audio signals some much-needed movement with these six rhythmic plugin effects
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This plugin is, at its core, based on the classic Leslie rotating speaker effect, but the Lille-based developer has created it with far more layers of complexity than your classic Lezzer effect. There’s a dedicated Chorus module, two independent left and right delay times, horn and drum split, speed, acceleration, deceleration, and start and stop with choice of ‘Park Angle’, which basically determines what angle the horn or drum will end up when they stop spinning. You can determine the movement path for the entire speaker inside a virtual room, clockwise or counterclockwise, with Room Size and speaker Diameter, and to cap it all off, emulation of two virtual microphones and their positioning in the virtual room. Too much, you say? Well, if you’re just using it to give a synth part a little more depth, then maybe so – but if you’re using EARevolve on a significant element of a track (guitar or piano, maybe), it’s a must-have.



Judging by l'name, you can guess that this is another Leslie-style rotary speaker emulation. Visuals are scant, with the ‘horn’ and ‘drum’ moving behind virtual slits, but it’s the sound that counts, with that classic Leslie tremolo (and chorale) sound emulated to a T. There’s plenty of customisation onboard too, with controls over the virtual mics.



Choose from 19 classic tremolo shapes (Danelectro, Wurlitzer, Fender…) or more fanciful patterns (City, Boosom, SlippySine…) to get your Shape, then dial in Depth, Groove and Feel (shuffle and phase, basically) to customise it. You can set the Rhythm in beats, adjust the Rate and Tap Tempo, although some preset shapes are too complicated to fully adjust the Rhythm control. With a twitch of the Tweak button, things get nerdy, with a custom LFO waveshape editor, Threshold before modulation, Attack and Release, and amplification style. The only drawback? The interface is a bit crowded for today’s standards.



If Cableguys’ FilterShaper, TimeShaper, PanShaper, VolumeShaper and WidthShaper weren’t good enough tools in their own right, ShaperBox brings them all together into one plugin. For each effect, choose a timebase and draw a pattern (or select a pre-made one) to have that Shaper’s property (ie, Width, Panning, Filter cutoff…) respond to what you’ve drawn. Results range from subtle undulation through rhythmic transformation to all-out glitching madness, and with nine onboard MIDI triggers to recall patterns you saved earlier, it’s ever so easy to impress. ShaperBox – and the rest of the ’Shaper gang – make for creative results in no time.



Melda’s plugin interfaces are legendary throughout the world for being a bit tough, but MRhythmizer’s actually makes a lot of sense. A 2-dimensional plane arranges time and the amount of effect applied, said effects being Time, Volume and Filter. Not only is the X/Y co-ordinate graph an intuitive way to get your head around how you’re affecting the signal, there are also plenty of preset shapes and transfer curves to get you going. Glitching, gating, scratching and subtle warbling are all possible. Oh, and the price is most certainly right as well.



This plugin models seven types of trem: chorus and vibrato effects on one side, and panning: Leslie and Wow/Flutter on the other. Each side has Rate and Amount controls, plus 11 LFO shapes each to modulate them with. The movement of each is mapped to either X or Y in the beautiful onboard oscilloscope. Tube Modulator very faithfully models some of rock’s most classic trems ’n’ vibes, bringing a curated set of warm, complex tones that add the perfect moody ambience to solo parts. All of this comes at a distinctly reasonable outlay. Shine on you crazy well-priced bi-directional VST plugin modulation effect!