Rabbi Welcher on Tekios on Rosh Hoshana 2010 – mp3 can be download here.
Rabbi Oelbaum on Teshuva 2010 – mp3 can be download here.
Rabbi Yonason Sacks on Teshuva – mp3 can be download here.
Rabbi Welcher on Selichos night from 2007 can be downloaded here.
Rabbi Welcher on Halachos of Blowing Shofar from 2007 can be downloaded here.
R’ Dovid Schwartz on Rabbi Yonah of Gerona – Guilt is Good can be download here.
R’ Moshe Schwerd on Rosh Hoshana – Why Change is Possible can be downloaded here.
R’ Moshe Schwerd on Din V’Cheshbon can be downloaded- here.
R’ Daniel Stein on Hilchos Teshuva – Chapter 2 can be downloaded here.
R’ Yechezkel Rosenberg on How Loud Can You Daven on Yomim Noraim and Other Times can be downloaded here.
R’ Yakov Haber on Rosh Hoshana davening can be downloaded here.
R’ Yakov Haber on Rosh Hoshana and Hirhur Teshuva according to Rav Soloveitchik can be downloaded here.
http://www.insidechassidus.org/fall/16-tishrei-yom-tov-holiday-series.html
Excellent series of lectures from Rabbi Yossi Paltiel if you are looking to add some chassidus to your Tishrei learning.