I am an user of the Allen & Heath CQ-18T in live sound applications (vocals, music, events).
I would like to request the addition of an adjustable HPF slope (e.g. 6 / 12 / 18 / 24 dB/oct) or selectable filter types. The current HPF implementation feels too gentle/gradual in practice. As a result, it often requires setting the cutoff frequency higher than desired in order to achieve effective low-frequency attenuation, which remove useful low-mid content and affect the natural tone of vocals and instruments.
This is something that becomes quite limiting and genuinely frustrating in real-world use. A fix or improvement here would make a significant difference and greatly improve workflow and sound quality in live situations.
Thank you for your consideration.