diff --git a/crates/bistortion/Cargo.toml b/crates/bistortion/Cargo.toml
new file mode 100644
index 0000000..b2faa52
--- /dev/null
+++ b/crates/bistortion/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "bistortion"
+version = "0.1.0"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+baseplug = { git = "https://github.com/wrl/baseplug.git", rev = "9cec68f31cca9c0c7a1448379f75d92bbbc782a8" }
+serde = "1.0.126"
+
+# utils = { path = "../utils" }
diff --git a/crates/bistortion/src/lib.rs b/crates/bistortion/src/lib.rs
new file mode 100644
index 0000000..00cf45b
--- /dev/null
+++ b/crates/bistortion/src/lib.rs
@@ -0,0 +1,67 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+use baseplug::{Plugin, ProcessContext};
+use serde::{Deserialize, Serialize};
+
+baseplug::model! {
+    #[derive(Debug, Serialize, Deserialize)]
+    struct BistortionModel {
+        #[model(min = 0.0, max = 10.0)]
+        #[parameter(name = "a")]
+        a: f32,
+        #[model(min = 0.0, max = 30.0)]
+        #[parameter(name = "b")]
+        b: f32,
+    }
+}
+
+impl Default for BistortionModel {
+    fn default() -> Self {
+        Self { a: 1.0, b: 1.0 }
+    }
+}
+
+struct Bistortion {
+    frame: usize,
+}
+
+impl Plugin for Bistortion {
+    const NAME: &'static str = "bistortion";
+    const PRODUCT: &'static str = "bistortion";
+    const VENDOR: &'static str = "unnieversal";
+
+    const INPUT_CHANNELS: usize = 2;
+    const OUTPUT_CHANNELS: usize = 2;
+
+    type Model = BistortionModel;
+
+    #[inline]
+    fn new(_sample_rate: f32, _model: &BistortionModel) -> Self {
+        Self { frame: 0 }
+    }
+
+    #[inline]
+    fn process(&mut self, model: &BistortionModelProcess, ctx: &mut ProcessContext<Self>) {
+        let input = &ctx.inputs[0].buffers;
+        let output = &mut ctx.outputs[0].buffers;
+
+        for i in 0..ctx.nframes {
+            let a = model.a[i];
+            let b = model.b[i];
+            let p = self.frame as f32 / ctx.sample_rate;
+
+            output[0][i] = process(input[0][i], p, a, b);
+            output[1][i] = process(input[1][i], p, a, b);
+
+            self.frame += 1;
+        }
+    }
+}
+
+// https://www.desmos.com/calculator/8gmb283p0v
+fn process(v: f32, p: f32, a: f32, b: f32) -> f32 {
+    (v * a * (b * v).cos()).tanh()
+}
+
+baseplug::vst2!(Bistortion, b"bist");
diff --git a/macos.sh b/macos.sh
index a601719..499f405 100755
--- a/macos.sh
+++ b/macos.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
-# Make sure we have the arguments we need
+set -e
+
 if [[ -z $1 ]]; then
   echo "Builds, bundles and copies to /Library/Audio/Plug-Ins/VST a package"
   echo "Example:"