diff --git a/doc/README.md b/doc/README.md
index 4ce663a..d0509c0 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -293,7 +293,7 @@ GVerb algorithm from SWH plugins.
 
 > A utility plugin that inverts the signal, also (wrongly) known as a 180 degree phase shift.
 
-## `tapedelay split index`
+## `tapedelay split index speed da_db t1d t1a_db...`
 
 **TODO:** gives 0 output
 
@@ -311,3 +311,9 @@ GVerb algorithm from SWH plugins.
  - t3a\_db (tap 3 level, dB): -90..0, default -90
  - t4d (tap 4 distance, inches): 0..4, default 3
  - t4a\_db (tap 4 level, dB): -90..0, default -90
+
+## `moddelay split index`
+
+> A delay whose tap can be modulated at audio rate.
+
+ - base (base delay, seconds): 0..1, default 1
diff --git a/examples/moddelay.scri b/examples/moddelay.scri
new file mode 100644
index 0000000..202cafb
--- /dev/null
+++ b/examples/moddelay.scri
@@ -0,0 +1,3 @@
+load :0;
+moddelay 3 1 1;
+quicksave;
diff --git a/src/lang.zig b/src/lang.zig
index dd91bd6..ae3e8cd 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -38,6 +38,7 @@ pub const CommandType = enum {
     Gverb,
     Invert,
     TapeDelay,
+    ModDelay,
 
     Noise,
     WildNoise,
@@ -205,6 +206,7 @@ pub const Lang = struct {
         _ = try self.keywords.put("gverb", .Gverb);
         _ = try self.keywords.put("invert", .Invert);
         _ = try self.keywords.put("tapedelay", .TapeDelay);
+        _ = try self.keywords.put("moddelay", .ModDelay);
 
         // custom implementations (not lv2)
         _ = try self.keywords.put("noise", .Noise);
diff --git a/src/printer.zig b/src/printer.zig
index 8491328..6dfc508 100644
--- a/src/printer.zig
+++ b/src/printer.zig
@@ -32,6 +32,7 @@ pub fn printList(list: langs.CommandList, stream: var) !void {
             .Gverb => "gverb",
             .Invert => "invert",
             .TapeDelay => "tapedelay",
+            .ModDelay => "moddelay",
 
             .Noise => "noise",
             .WildNoise => "wildnoise",
diff --git a/src/runner.zig b/src/runner.zig
index 7bc870d..3a9a007 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -354,6 +354,11 @@ pub const Runner = struct {
         try image.runPlugin("http://plugin.org.uk/swh-plugins/tapeDelay", pos, params);
     }
 
+    fn moddelayCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://plugin.org.uk/swh-plugins/modDelay", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -664,6 +669,12 @@ pub const Runner = struct {
                 try self.tapedelayCmd(pos, params);
             },
 
+            .ModDelay => {
+                const pos = try cmd.consumePosition();
+                try cmd.appendParam(&params, "base");
+                try self.moddelayCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", .{cmd.command});
                 break :blk RunError.UnknownCommand;