With regard to electronic voting, there have been a number of studies, which were not commissioned by Elections Canada, that examined the impact of on-line voting on voter participation. The results are not necessarily very conclusive, but it appears it had a very positive effect on voter participation at the municipal level. Some municipalities in Canada have used on-line voting, and they have observed a certain increase in voter participation.
I also know that Switzerland conducts its referenda on-line and has indeed observed an increase in voter participation. However, there is no uniform finding across all systems that use on-line voting.