Reluctant to miss an opportunity to hear the great clarinettist Eric Hoeprich, especially after his sensitively nuanced performance of Mozart's Kegelstatt Trio for the Boston Early Music Festival, I found it necessary, unfortunately, to miss an important BEMF evening in order to make the trek out to Brandeis. Daniel Stepner in fact apologized for the conflict, promising to avoid them in the future. Indeed, it would be to the advantage of Boston audiences if the two festivals could pool their resources to make it possible for BEMF audiences to hear the Aston Magna musicians, especially this one, devoted to a rarely heard, obsolete elder sibling of the clarinet, the chalumeau.