I've heard mixed reviews about "Velocity Banking." I've also heard it is sometimes tied to what amounts to a Multi Level Marketing program. One should use extra caution whenever someone is making money from referrals.
The Smith Maneuver works well for investors.
Ensure your personal mortgage has an automatically re-advancing HELOC attached, and commit that credit line to business/investment purposes only. Use any excess rental income to pay down your personal mortgage - remember, the CRA doesn't care where you put the cash as long as you record it properly as income. As you pay down your personal mortgage, the HELOC limit increases and you may use that credit for renovations or down payments or expenses on your rental portfolio. AND the interest on your HELOC is tax deductible!
Once your non-tax-deductible personal mortgage is paid off, start paying down the HELOC. (Or not, it's up to you.)
Advanced strategy: get the longest possible amortization on your personal mortgage and sign up to automatically double down on your monthly payments. This way, you pay down the mortgage WAY faster, but the minimum required mortgage payment you would list on other mortgage applications is lower (because it doesn't count the voluntary extra payment), so your DCR is better making it is easier to qualify for more rental property mortgages, and yet you are still making huge payments to your personal mortgage. I paid off my $200k mortgage in less than 3 years using this strategy.