Controlling Number of Epochs in an Average?

Hello All,

     I am collecting data from an auditory oddball
paradigm where, by definition, the standard tones
outnumber the targets and novel sounds. In order to
maintain a constant SNR across all three conditions I do
not want to compare evoked responses created from
different numbers of epochs. Is there a way to control the
number of epochs allowed into the average in
mne_process_raw on a condition-wise basis? The only other
solution I can think of is to create a custom events list.

     Thanks,

Per Lysne, MIND Research Network