===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/sndiod/dev.c,v
retrieving revision 1.79
retrieving revision 1.80
diff -u -r1.79 -r1.80
--- src/usr.bin/sndiod/dev.c	2021/01/28 11:06:07	1.79
+++ src/usr.bin/sndiod/dev.c	2021/01/28 11:06:58	1.80
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dev.c,v 1.79 2021/01/28 11:06:07 ratchov Exp $	*/
+/*	$OpenBSD: dev.c,v 1.80 2021/01/28 11:06:58 ratchov Exp $	*/
 /*
  * Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
  *
@@ -948,9 +948,15 @@
 		 * s->ops->onmove() may remove the slot
 		 */
 		snext = s->next;
-		pos = (long long)delta * s->round + s->delta_rem;
+		pos = s->delta_rem +
+		    (long long)s->delta * d->round +
+		    (long long)delta * s->round;
+		s->delta = pos / (int)d->round;
 		s->delta_rem = pos % d->round;
-		s->delta += pos / (int)d->round;
+		if (s->delta_rem < 0) {
+			s->delta_rem += d->round;
+			s->delta--;
+		}
 		if (s->delta >= 0)
 			s->ops->onmove(s->arg);
 	}