(I liked the other review. There you can find all information of how to use this plugin. But after more than 10 years of the old review, I want to add something to it and tell you why I give this plugin 5 out of 5 stars, and not just 4.)
When you first take a look at the plugin, it doesn't actually quite look very nice. The UI is a little confusing and you don't know what to do with it. I got it for a long time in my plugin library now, but never used it until today because I didn't understand how to use it properly.
It is actually quite simple. Way simpler than it looks like.
You have the top section, where you can delay the signal in milliseconds (MSEC) and the bottom section, where you can delay the signal in samples. Both sections work additionally, so the final delay is the sum of both. If you let one section out it is fairly okay; then only the delay of the other is counted.
Each dial belongs to a decimal position of either a millisecond or sample, and just like a mathematical abacus (if you're familiar with this stone-old math device), You're adding entities of units and units to get a sum. F.e. you pull the dial of the parameter x0.1 to the value 2, and the parameter x0.01 to 3, and you will get a delay of 1 millisecond (msec) * (0.1 * 2) * (0.01 * 3) = 0,23 milliseconds.
x1 milliseconds = 0,001 second x10 milliseconds = 0,01 second x100 milliseconds = 0,1 second x1000 milliseconds = 1 second.
Adding samples works similar.
As a help, you can get the resulting value easily in each seaction by reading the values inside of the black boxes below dials together.
Now if you don't like calculating like this to get the value you desire, you also have the option to type in the delay value (ms) in the field at the top right corner of each section directly.
The summary max in the recent version is 12 seconds, that is all knobs panned to the right. So you can create delays from 0.01 milliseconds up to 12 seconds now.
What to add?
The routing of the other reviewer is fairly much complexer than necessary because, and that is the reason why this plugin earns 5 stars, you can do this already inside of the plugin itself (giving the premise that the signal is already stereo, even tough it might be just pseudo stereo - dual mono).
This plugin has the possibility to delay the right and/or the left channel (Dual Mono mode) or the Mid and/or Side channel (Mid-Side Stereo mode) independently. No hard setup or routing required.
Even in the terms of Mid/side processing this makes this plugin very outstanding. You might be able to find alternative plugin to delay either the left or righ channel of a stereo signal, but not a single one to do this with the sum and difference.
'Sound Delay' is not a traditional echo-type of delay-effect. It is something as simple as a signal-delay. Essentially, all it does is delay your audio signal with the user-specified amount of samples or milli-seconds! - and I doubt that any other plugin performs this task with as much precision, style and value-for-cash (it is freeware!). 'Sound Delay' allows you to delay a signal by up to 3 seconds, and anything in-between, be it 1 sample, 10 milli-second or 1 second.
... but do I even need a signal delayer?
The simple answer is: "Yes!". There are many creative ways to use a signal delayer. Let me give some quick examples on my main-uses: Manual mono-to-stereo-conversion. Insert a sampler-channel and load, say, a mono hi-hat audio file into it. Assign it to mixer-insert 1 and pan it 75% towards 'L'. Clone the channel, and assign the clone to mixer-insert 2 and pan it 75% towards 'R'. Go to mixer-insert 2 and insert the 'Sound Delay' plugin. Turn the "X10" knob to '1' and the "X1" knob to, say, '3'. Voila! The mono hi-hat is now in stereo because we've doubled the signal and delayed one of them by 13 milli-seconds (if my calculations are right... the results are what count, right?). Experiment with longer/shorter delay-times and more extreme panning-amounts for wider stereo-field. NB: Just remember to keep the volume and panning level of both channels the exact same levels.
Okay! What more?
More uses you say? My answer is: Humanization. If you produce songs that needs swing and live-feeling then try adding a subtle-yet-not-necessarily-too-subtle 'Sound Delay' effect on the sound's mixer-insert. It works wonders on, again, the hi-hat, the bass-line or maybe even the snare (although you can achieve better results for the snare by adjusting the 'Shift' value to unique levels for each snare-hit in your DAW). For humanization purposes the best results are achieved by delaying "background sounds" as to not push lead sound(s) which might change the song's groove - you only want to create a feeling of looseness.
Done with style!
Most of you will already know the aforementioned techniques, but it's gold for more inexperienced producers and beat-makers. Yet signal delaying is a trick forever useful to carry in your bag-of-tricks, so the 'Sound Delay' plugin is definitely a keeper! Visually, the plugin boasts Voxengo's classic GUI from most of their plugins which not only looks nice, but offers extended functionality once you learn how they work. Finally, as with most still-updated Voxengo plugins there is also a 64-bit version for the 64-bit fanatics. Cool, but I hardly see the point for this type of small effect-plugin.
Okay, so maybe a signal delayer is not the most exciting, exotic plugin-type known to man. It's a simple trick which is also why this plugin doesn't get a top-score. It is, however, very useful, and this one is done with Voxengo's usual eye-for-detail plus you can't go wrong for the price (if you missed it, it's free!), so two thumbs up! 8/10