IIEQ Pro CM is part of the DDMF CM EQ Pack, which is free with Computer Music magazine issue 179. The pack contains two equaliser plug-ins for PC and Mac, in VST and AU formats: IIEQ Pro CM is an all-purpose EQ, whereas LP10 is focused more on mastering, offering linear phase and variable phase operation. They are based on DDMF's commercial IIEQ Pro and LP10 plug-ins.

Common features of both plug-ins:

• Six bands of EQ.
• Click and drag on graph to create and edit EQ bands.
• Create/edit EQ bands directly via lower parameter strip.
• A/B comparison.
• Adjustable graph scale (-5:5dB, -10:10dB, -20:20dB).
• Use mouse-wheel to adjust band Q.
• Hold Ctrl to "auto-listen" to the band.
• Output gain dial.

IIEQ Pro CM features:

• 19 filter types in total: 12 standard, 7 Butterworth.
• Analogue- and digital-style peak/bell filters.
• Low and high shelving filters.
• 12dB/24dB low- and high-pass filters.
• Band-pass filtering with compensated/normalised mode.
• All-pass filter.
• 7 Butterworth filters, with up to 10th order operation, for super-steep filtering.
• Unusual Butterworth band-shelf filter - like a flat-topped bell/peak.
• Series or parallel operation (useful in conjunction with all-pass mode, for phasing effects).

The full, paid-for versions of IIEQ Pro and LP10 offer the following additional features:

• 10 bands instead of 6.
• Built-in spectrum analyser.
• Stereo and mid/side operation.