The webapp provides for each item the link on ECB's website.
Speeches for : Fabio Panetta where "volume" appeared
2021-06-15 : Cash still king in times of COVID-192020-11-27 : From the payments revolution to the reinvention of money
2020-10-22 : On the edge of a new frontier: European payments in the digital age
2020-04-28 : Beyond monetary policy – protecting the continuity and safety of payments during the coronavirus crisis