MAutoPitch

MAutoPitch is a simple but great-sounding automatic pitch correction plugin for vocals and other monophonic sounds. MAutoPitch not only improves audio quality, but it also offers creative features like formant shift and stereo expansion. It is quick, simple to use, and free! Included with the MFreeFXBundle, MTotalFXBundle, and MCompleteBundle!

Features and Highlights

• The most powerful user interface in the market: stylable, resizable, and GPU-accelerated. 
• Unique visualization engine with traditional meters and time graphs. 
• Multiple parameters, including M/S, single-channel, and up to 8 channels for surround processing. 
• Automatic Gain Compensation (AGC) 
• Safety limiter 
• MIDI controllers support 64-bit processing and infinite sampling rate. 
• Extremely fast, optimized for the most recent AVX2 and AVX512 capable processors. 
• Manage global presets and swap them online. 
• Supports VST, VST3, AU, and AAX interfaces on Windows and Mac, both 32-bit and 64-bit. 
• No dongle or internet connectivity is required for activation. 
• Free-for-life updates

Note: The sample version has limited functionality.

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Also, check out: LMMS (32-bit)