ADT - Artificial Double
The ADT technique was developed
at Abbey Road Studios by engineers recording the
Beatles in the 1960s. To free John Lennon from
having to sing everything twice for real double
tracking they came up with an artificial
replacement: they sent the original signal to
another tape machine and re-recorded it. Due to
the physical distance between record and
playback heads the new signal was delayed. The
length of the delay depends on the tape speed
(the slower the tape is running the longer it
takes for the signal to travel from the record
to the playback head). However, due to the
machine’s (small amounts of) Wow and Flutter the
delay time was not fixed but varied slightly,
giving an additional chorus-like effect.
The ADT Plug-In takes a mono input
signal and creates a stereo output. The original
input signal will be output on one channel the new
ADT signal on the other. Blending the two is also
possible. The Plug-In allows to control the delay
time (10 - 50ms), Wow and Flutter (both with
intensity in % and frequency). All values are based
on the technical data of the tape machine that was
originally used to create this effect.
RIAA - phono equalization
This Plug-In provides normal and
inverse RIAA equalization. It thus can be used
for record playback or vinyl cutting purposes.
Another nice trick is to use it to simulate
certain ‘vinyl sound effects’ by applying the
inverse RIAA curve to your signal and after
running it through a compressor converting it
back to flat.
“RIAA - phono equalization” works at
the standard sample rates from 44.1kHz up to 96kHz.
Both plug-ins are available for
Windows and Mac (including 64-bit support, VST/AU).
Donations are welcome.