On Apr 20, 2017, at 1:13 AM, pd-list-request@lists.iem.at wrote:From: Lucas Cordiviola <lucarda27@hotmail.com>Subject: Re: [PD] pd 0.47.1 Changing Block Size in Audio Settings hangs programDate: April 19, 2017 at 10:23:48 PM MDTTo: Leo Wang TIC-work <leointic@hotmail.com>, "pd-list@lists.iem.at" <pd-list@lists.iem.at>Hi,Iirc Pd's preferences “Block Size” is only meant to be used with ASIO drivers on MsWindows.This setting controls the buffer size of your ASIO driver.Salutti,Lucarda.