diff --git a/adlib.c b/adlib.c
index 0c4fff7..5f0e6ce 100755
--- a/adlib.c
+++ b/adlib.c
@@ -1,5 +1,6 @@
 #include "adlib.h"
 
+int adlib_present;
 static void adlib_wait(int delay) {
   int i;
   for (i = 0; i < delay; i ++) adlib_read();
@@ -20,7 +21,22 @@ void adlib_reset() {
   }
 }
 
-void adlib_init() {
-  adlib_reset();
-  atexit(adlib_reset);
+void adlib_detect() {
+  int status1, status2;
+  adlib_write(4, 0x60);
+  adlib_write(4, 0x80);
+  status1 = adlib_read();
+  adlib_write(2, 0xff);
+  adlib_write(4, 0x21);
+  adlib_wait(160);
+  status2 = adlib_read();
+  adlib_present = (status1 & 0xe0) == 0 && (status2 & 0xe0) == 0xc0;
+}
+
+void adlib_init() {
+  adlib_detect();
+  if (adlib_present) {
+    adlib_reset();
+    atexit(adlib_reset);
+  }
 }
diff --git a/adlib.h b/adlib.h
index 009857f..1523257 100755
--- a/adlib.h
+++ b/adlib.h
@@ -1,5 +1,6 @@
 #include <dos.h>
 
+extern int adlib_present;
 void adlib_init();
 #define adlib_read() inp(0x388)
 void adlib_write(int reg, int val);
diff --git a/boot.jim b/boot.jim
index 93ad3d2..a3f1549 100755
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diff --git a/debug.jim b/debug.jim
index 5af2f12..b09d42b 100755
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diff --git a/defs.jim b/defs.jim
index 4cc3021..cef31c0 100755
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diff --git a/end.jim b/end.jim
index 707c5b1..e6a81ba 100755
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diff --git a/entity.jim b/entity.jim
index 07a0e17..857078c 100755
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diff --git a/fakelib.c b/fakelib.c
new file mode 100755
index 0000000..984726d
--- /dev/null
+++ b/fakelib.c
@@ -0,0 +1,51 @@
+#include "fakelib.h"
+#include "timer.h"
+
+void fakelib_shutup() {
+  outportb(0x61, inportb(0x61) & 0xfc);
+}
+
+void fakelib_init() {
+  atexit(fakelib_shutup);
+}
+
+static unsigned int remaining_ticks;
+static unsigned int last_tick;
+static unsigned int fnumlow;
+void fakelib_write(int reg, int val) {
+  if (reg == 0xa0) { // writing a new frequency to voice 0
+    fnumlow = (val & 0xff);
+  } else if (reg == 0xb0) {
+    if (val & 0x20) {
+      unsigned long fnum = ((val & 0x03) << 8) | fnumlow;
+      unsigned int oct = (val & 0x1c) >> 2;
+      unsigned long div = (24L << (20 - oct)) / fnum;
+      unsigned char tmp;
+
+      outportb(0x43, 0xb6);
+      outportb(0x42, div & 0xff);
+      outportb(0x42, (div >> 8) & 0xff);
+      outportb(0x61, inportb(0x61) | 0x03);
+
+      // todo: guess at duration based on instrument decay
+      remaining_ticks = 2;
+      last_tick = timer_counter;
+    } else {
+      fakelib_shutup();
+      remaining_ticks = 0;
+    }
+  }
+}
+
+void fakelib_tick() {
+  if (remaining_ticks > 0) {
+    unsigned int tickdiff = timer_counter - last_tick;
+    if (tickdiff >= remaining_ticks) {
+      fakelib_shutup();
+      remaining_ticks = 0;
+    } else {
+      remaining_ticks -= tickdiff;
+    }
+  }
+  last_tick = timer_counter;
+}
\ No newline at end of file
diff --git a/fakelib.h b/fakelib.h
new file mode 100755
index 0000000..eacad42
--- /dev/null
+++ b/fakelib.h
@@ -0,0 +1,3 @@
+void fakelib_init();
+void fakelib_write(int reg, int val);
+void fakelib_tick();
diff --git a/footer.jim b/footer.jim
index 41d3f27..3c0eb6d 100755
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diff --git a/game.jim b/game.jim
index 7e24001..4d73e36 100755
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diff --git a/input.jim b/input.jim
index ec6afa8..4e3ee8d 100755
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diff --git a/jiles.jim b/jiles.jim
index fad390b..1b1a97a 100755
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diff --git a/job.jim b/job.jim
index 1a41319..f943079 100755
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diff --git a/lev00001.jim b/lev00001.jim
index 7e5e12a..85f14d4 100755
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diff --git a/lev00002.jim b/lev00002.jim
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diff --git a/lev00003.jim b/lev00003.jim
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diff --git a/lev00004.jim b/lev00004.jim
index 8cbd9a2..37b9c1c 100755
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diff --git a/lev00005.jim b/lev00005.jim
index 5eeefd8..e91484f 100755
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diff --git a/lev00006.jim b/lev00006.jim
index dffbad6..8d46439 100755
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diff --git a/level.jim b/level.jim
index 68edf52..7767b90 100755
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diff --git a/map.jim b/map.jim
index d5f27a0..76ab8a0 100755
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diff --git a/neuttowr.exe b/neuttowr.exe
index ea6c40f..9215f88 100755
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diff --git a/neuttowr.prj b/neuttowr.prj
index 0fa410d..863ad26 100755
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diff --git a/sound.jim b/sound.jim
index ad7c171..645c738 100755
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diff --git a/state.jim b/state.jim
index 49509bf..628ab22 100755
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diff --git a/testbed.c b/testbed.c
index 3d0f78f..dd046a7 100755
--- a/testbed.c
+++ b/testbed.c
@@ -18,6 +18,7 @@
 #include "jorth.h"
 #include "egamap.h"
 #include "adlib.h"
+#include "fakelib.h"
 
 /*** T E X T ***/
 char far *font = NULL;
@@ -270,6 +271,8 @@ void game_init() {
   timer_init(TIMER_30HZ);
   text_init();
   adlib_init();
+  fakelib_init();
+  timer_setcallback(fakelib_tick);
 
   loadscr("title");
 /*  f = fopen("TITLE.TIF", "rb");
@@ -407,11 +410,20 @@ void f_drawportrait() {
   DROP(1);
 }
 
+int use_adlib;
 void f_adlib() {
-  adlib_write(TOP().u, ST1().u);
+  if (use_adlib) {
+    adlib_write(TOP().u, ST1().u);
+  } else {
+    fakelib_write(TOP().u, ST1().u);
+  }
   DROP(2);
 }
 
+void f_adlib_present() {
+  PUSHI(adlib_present);
+}
+
 cell f_atexit;
 void f_cleanup() {
   f_execcp(f_atexit);
@@ -827,6 +839,9 @@ void game_f_init(char *exe, char *bootjor) {
   CDEF("boss", f_showboss);
   CDEF("system", f_system);
   CDEF("adlib!", f_adlib);
+  CDEF("adlib?", f_adlib_present);
+  PCONST("use-adlib", &use_adlib);
+  use_adlib = adlib_present;
 
   CDEF("mouseshow", f_mouseshow);
   CDEF("mousehide", f_mousehide);
diff --git a/timer.jim b/timer.jim
index b622560..89ef1b7 100755
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diff --git a/title.jim b/title.jim
index 4680cd7..883abbd 100755
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