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 Otto by JELSTUDIO is a Virtual Effect Audio Plugin for Windows. It functions as a VST Plugin.
Product Otto
Price (MSRP)
127 £ (British Pound Sterling)
Type / Tags AutomationATSCATSC A/85Auto DC-OffsetAuto EQAuto Gain NormalizerAuto LevelerAuto LimiterAuto LoudnessAuto VolumeCalm ActDC-OffsetDynamics ProcessorITU-R bs1770K-filterLevelerLevelingLimiterLoudnessLoudness NormalizerNormalizer
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
  Download Released
System Requirements
VST host
Miscellaneous Information
Copy ProtectionNone
Important Note
Listed price includes tax, so there is no extra price added during check-out!


An automatic amplitude wave-shape equalizer for LIVE or mixing/mastering use.

Otto normalizes audio automatically by re-shaping the wave-form to its largest possible size, thereby minimizing the amount of unused headroom.

It is not exactly a dynamic gain-stager, auto-leveler, compressor, DC offset remover, asymmetry remover, dynamic tonal equalizer or limiter, but those would be terms that are not too far off what Otto can be used for.

Technically it is a 32/64-bit VST2 audio-effect plugin mainly for DAWs and sound/video-editors on Windows, but it can also be used in a LIVE VST-host (for example with LIVE stage-performance audio, or with music/TV home-stereo audio)

A few ideas of what Otto can be used for: to balance dialog and sound-effects when watching movies, to avoid loud commercials when watching TV-shows, to balance loudness between songs when listening to music, to balance and maximize track-volume when mixing, to even the levels between songs when mastering a demo.

It is suitable for all music-styles (ranging from delicate classical music, over soft singer/songwriter or country, to hard-hitting techno, drum'n'bass and even hardcore gabber)

Some of Otto's key-points:

  • Average RMS volume (flat, unweighted) is adjusted to ~ -18 dB FS (can vary with settings).
  • Runaway volume peaks are clipped at -0.1 dB FS.
  • Zero latency (for LIVE use or for tracking).
  • DC offset is removed.
  • Stereo imbalance can be canceled (when stereo-channels are unlinked).
  • Stereo image can be dynamically widened to the maximum mono-safe width (when Mid/Side mode is activated).
  • Waveform asymmetry can be minimized (this is the only mode with latency, about 1/5th of a second or ~8000 samples).
  • Can handle incoming audio-signals that has 'overs' (internally handles signals hotter than 0dB, either real peaks or ISPs).
  • Program-dependent THD+N (~0.01% distortion in Classical-music mode).
  • Program-dependent harmonic-response curves (Flat in Classical-music mode, 'Smiley'-curve in HappyHardcore-music mode).
  • Works on mono and stereo signals.
  • Can be locked ('glued') to incoming audio's amp-envelope.
  • Can dynamically EQ the tonal sound in various ways.
  • GUI layout is optimized for 'peripheral vision overview' (when looking at the center of the GUI; all important displays can be read at a glance with peripheral vision).
  • Auto Loudness (inspired by ITU-R BS.1770-4, but with some differences (see manual for info)).
Latest User Reviews Average user rating of 0.00 from 0 reviews


Discussion: Active
sebastien wittebolle
sebastien wittebolle
24 March 2016 at 7:53am

Hi, i have tested and buy this plugin. At the start of this VST plugin (first version) i don't like too much the sound, but with last version, the sound is far better with less distortion and add feature like asymmetry minimizer.

The author take care of "notice" from customers ! good point .

I hope than future version will still better .

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