diff --git a/src/custom.zig b/src/custom.zig
index a91bdd2..0420bd3 100644
--- a/src/custom.zig
+++ b/src/custom.zig
@@ -16,15 +16,12 @@ pub const RandomNoise = struct {
 
     pub fn init(
         allocator: *std.mem.Allocator,
-        params: *plugins.ParamMap,
+        params: var,
     ) ?RandomNoise {
-        const seed = @floatToInt(u64, params.get("seed").?.value);
-        const fillbytes = @floatToInt(usize, params.get("fill_bytes").?.value);
+        var r = std.rand.DefaultPrng.init(params.seed);
 
-        var r = std.rand.DefaultPrng.init(seed);
-
-        if (fillbytes > 0) {
-            var rand_buf = allocator.alloc(f32, fillbytes) catch return null;
+        if (params.fill_bytes > 0) {
+            var rand_buf = allocator.alloc(f32, params.fill_bytes) catch return null;
 
             for (rand_buf) |_, idx| {
                 rand_buf[idx] = r.random.float(f32);
@@ -67,15 +64,12 @@ pub const WildNoise = struct {
 
     pub fn init(
         allocator: *std.mem.Allocator,
-        params: *plugins.ParamMap,
+        params: var,
     ) ?WildNoise {
-        const seed = @floatToInt(u64, params.get("seed").?.value);
-        const fillbytes = @floatToInt(usize, params.get("fill_bytes").?.value);
+        var r = std.rand.DefaultPrng.init(params.seed);
 
-        var r = std.rand.DefaultPrng.init(seed);
-
-        if (fillbytes > 0) {
-            var rand_buf = allocator.alloc(f32, fillbytes) catch return null;
+        if (params.fill_bytes > 0) {
+            var rand_buf = allocator.alloc(f32, params.fill_bytes) catch return null;
 
             for (rand_buf) |_, idx| {
                 rand_buf[idx] = @intToFloat(f32, r.random.int(u1));
@@ -118,10 +112,10 @@ pub const Write = struct {
 
     pub fn init(
         allocator: *std.mem.Allocator,
-        params: *plugins.ParamMap,
+        params: var,
     ) Write {
         return Write{
-            .data = params.get("data").?.value,
+            .data = params.data,
         };
     }
 
@@ -139,10 +133,10 @@ pub const Embed = struct {
     sndfile: *c.SNDFILE = undefined,
     buf: []f32 = undefined,
 
-    pub fn init(allocator: *std.mem.Allocator, params: *plugins.ParmaMap) @This() {
+    pub fn init(allocator: *std.mem.Allocator, params: var) @This() {
         return Embed{
             .allocator = allocator,
-            .filepath = params.get("path").?.value,
+            .filepath = params.path,
         };
     }
 
diff --git a/src/image.zig b/src/image.zig
index d677afa..b9202ef 100644
--- a/src/image.zig
+++ b/src/image.zig
@@ -422,7 +422,7 @@ pub const Image = struct {
         self: *Image,
         comptime Plugin: type,
         position: plugins.Position,
-        extra: *ParamMap,
+        extra: var,
     ) !void {
         var plugin_opt: ?Plugin = Plugin.init(self.allocator, extra);
         if (plugin_opt == null) {