![]() ![]() ![]() Impulse responses can be captured from real-world spaces or hardware units, allowing you to recreate the acoustics of a cathedral or the sound of a vintage amplifier, for example. It can be used to emulate specific environments or hardware, by applying a mathematical convolution to your audio with a pre-recorded impulse response file, effectively imprinting the characteristics of the original environment or hardware onto your sound. ![]() The FIR (Finite Impulse Response) Filter block is a powerful tool that uses impulse responses to filter audio. When that occurs, the secondary source (or sources) will be lowered to the Ducked Volume specified.Īmong other uses, the Ducking block is particularly helpful for doing voiceovers on top of music. Its audio will not be heard at all until it reaches the specified Overlay Threshold. The first source connected to a Ducking block is called the “Overlay” source. The Ducking block causes the volume of a source (or sources) to be lowered automatically when a specified source reaches a pre-defined volume. To obtain the optimal results, you'll likely want to experiment with the settings on each block frequently. The Remaining Noise Floor setting controls how much noise is left in the audio, to avoid unnatural silences and artifacts caused by noise removal. The Noise Reduction setting adjusts how aggressively the block will remove noise, with higher settings removing more noise. Once the block has been taught a noise, it will work to remove it from audio that passes through it. Denoise must be trained with an example of the audio you wish to remove, by clicking the Learn Noise button while audio is flowing. The Denoise block can be used to remove specific noises found in your audio. Take note of the two built-in presets, which will help remove two common base frequencies, 50 and 60 Hz. The Base Frequency setting should be adjusted to identify the frequency of the hum you wish to remove, while the Dehum Amount setting adjusts how aggressively the block will remove hum. The Dehum block can remove low frequency hum, which may be a result of a lack of proper electrical grounding in the original recording. A higher threshold will result in fewer repairs, but better avoid false positives. A lower threshold will repair more clicks, but may result in false positives. The Threshold slider adjusts the sensitivity of click detection. It can also help remove clicks caused by digital errors. The Declick block can be used to restore audio pulled from vinyl, which often has clicks, pops, and crackles. The Declick, Dehum, and Denoise blocks are each designed to assist in cleaning up audio that is corrupted in various ways, based on settings you provide. A brief overview of each of these blocks is included below. The Advanced section of Audio Hijack's block library contains several blocks which can help in less common scenarios. Support → Audio Hijack → Manual Advanced Blocks ![]()
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