Specs : 

Compressor

This  has two controls: output level and sustain level. The insta-patch  control may be taken as read from now on since it is present on each  module. The output level may be used to set the signal level as high as  possible to the rest of the circuit to ensure that noise is minimised.  This, of course, presupposes that the compressor is placed at the start  of the chain. The sustain control sets the compression ratio, with low  settings causing very little compression and allowing the signal to pass  more or less unchanged. Sadly, the two controls interact and increasing  the sustain level also increases the output level, making setting up  just slightly more involved. Compression range is quoted as 40dB. The added button is to turn on/off compressor. The original button doesn’t work properly. It was already done when I bought it.

Phaser

It  is slightly curious (though very welcome) that both a phaser and a  flanger are included in the same unit since the two effects are  essentially similar. The phaser features the usual controls - speed,  feedback (or depth) and width.

A wide range of effects may be  generated, ranging from typical high quality phasing through to the  characteristic poor imitation of a rotating speaker. This is obviously a  good example of a phaser: it features eight phase shift networks and  for my money outperforms most of the phasing effects available from  DDLs.

Distortion

The distortion is extremely  flexible, with controls to set overdrive level (the actual harshness of  the sound), tone, and output level (to bring the signal level back into  line with that of the input). In addition, if the overdrive is placed  immediately after the compressor, a judicious tweak of the compressor  output level can add a bit of muscle to the effect. After all, who's  going to worry about distortion setting in?

The module can  produce a useful range of effects varying from soft, gentle colouration  to full, power-driving heavy-metal, and for a transistor unit the  results really are quite respectable. The module is best used in  conjunction with the compressor to get a more professional sound; the  two effects complement each other well.

Stereo Chorus/Flanger

Obviously  the most flexible of the modules, this features the same controls as  the phaser with the addition of a switch (operated by pulling the width  pot) to switch from flanging to chorus, since only one or the other is  available at any one time.

The flanger ranks alongside DDL  flangers in terms of quality and character and offers delay times from  1.46ms to 12.8ms, which is comparable to its digital brethren.

The  chorus may be operated in one of two modes. If the main output alone is  used a standard mono chorus reminiscent of a 12-string effect is  obtained. However, if the stereo chorus output is used as well, an  anti-phase, pseudostereo image is produced if the two channels are  amplified separately. The results are very reasonable and thicken up a  signal (especially a guitar) immensely