# Parameter Selection

On this page, you select the type of parameter that you want to train on.

![The Parameter Selection set-up window](https://3465913129-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F35ssi0AM5G2ho2oSgGf3%2Fuploads%2Fv5vbMrTGJt1NQhgZvqyk%2FScreen%20Shot%202022-05-29%20at%2012.09.33%20pm.png?alt=media\&token=500490f3-d5d8-45ee-9dd5-3962c260636a)

{% hint style="info" %}
The Gain parameter is only selectable when either Shelving or Parametric Equalizers are selected in the previous step, because High/Low-pass, Bandpass, and Bandstop filters do not have a Gain parameter.
{% endhint %}

For High/Low-pass Filters, Q controls the level of the selected frequency. For example, a HPF at 100 Hz, Q 0.7 results in 100 Hz being attenuated by 3 dB.

For Shelving Filters, Q controls the bandwidth of the transition band. For Parametric Equalizers, Bandpass, and Bandstop filters, Q controls the bandwidth of the filter.