applied a patch to fix handling of s3m/it single-row loops:

sezero · sezero · commit 92d855e33798 · 2016-11-04T16:21:26.000+03:00
Konstanty#30 (comment) might possibly need more work, but hey...
diff --git a/src/snd_fx.cpp b/src/snd_fx.cpp
@@ -2120,7 +2120,12 @@ int CSoundFile::PatternLoop(MODCHANNEL *pChn, UINT param)
 		if (pChn->nPatternLoopCount)
 		{
 			pChn->nPatternLoopCount--;
-			if (!pChn->nPatternLoopCount) return -1;
+			if (!pChn->nPatternLoopCount)
+			{
+				if (m_nType & (MOD_TYPE_S3M|MOD_TYPE_IT))
+					pChn->nPatternLoop = m_nRow + 1;
+				return -1;
+			}
 		} else
 		{
 			MODCHANNEL *p = Chn;

Original file line number	Diff line number	Diff line change
`@@ -2120,7 +2120,12 @@ int CSoundFile::PatternLoop(MODCHANNEL *pChn, UINT param)`
`2120`	`2120`	`if (pChn->nPatternLoopCount)`
`2121`	`2121`	`{`
`2122`	`2122`	`pChn->nPatternLoopCount--;`
`2123`		`- if (!pChn->nPatternLoopCount) return -1;`
	`2123`	`+ if (!pChn->nPatternLoopCount)`
	`2124`	`+ {`
	`2125`	`+ if (m_nType & (MOD_TYPE_S3M\|MOD_TYPE_IT))`
	`2126`	`+ pChn->nPatternLoop = m_nRow + 1;`
	`2127`	`+ return -1;`
	`2128`	`+ }`
`2124`	`2129`	`} else`
`2125`	`2130`	`{`
`2126`	`2131`	`MODCHANNEL *p = Chn;`