Tape Emulation

Tape changes frequency response, saturation, wow and hiss at once; it is not just warmth.

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The problem

Tape is often treated as a synonym for warmth. It actually changes frequency response, saturation, wow and flutter, and hiss at once, and the combination is what we call tape sound.

How it works

Record and playback heads lose high end, earlier at lower speeds. Tape saturation is mostly odd-harmonic, and bias changes the ratio. Wow and flutter are slow and fast speed variations, producing pitch drift and tremolo respectively. Hiss depends on speed and track width. Plug-ins usually separate these stages, so drive, speed and noise can be set independently.

Settings and judgement

A light push glues, a heavy one becomes an effect. Hear whether the top darkens and the bass loosens before adding high end back. Too much wow drifts out of tune, so be careful across a whole mix. Noise should sit below the source floor, or it is just added hiss. When chaining, saturate before EQ so the noise is not lifted with the top end.

What to listen for

Whether cymbals lose their sandy detail, whether piano tails shorten, whether bass rounds out, and whether the whole image narrows. Match loudness before comparing with the untreated version.

Common misconceptions

That tape equals warmth, or that older plug-ins sound better. Tape also narrows and slows a sound; it cannot repair harshness, only dye it another colour.

Sources

• Zölzer, Udo，DAFX — Digital Audio Effects（Wiley）— 磁带饱和与抖晃建模章节核对，未引用
• Sound On Sound, tape emulation explained — 速度、偏磁与高频损失描述核对，未引用

Used for fact-checking only; all prose is original.