diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 32c4d1a5..9ff5963e 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -512,26 +512,35 @@ var audio_eq = (function () {
 	var r = {
 		"en": false,
 		"bands": [31.25, 62.5, 125, 250, 500, 1000, 2000, 4000, 8000, 16000],
-		"gains": [0, -1, -2, -3, -4, -4, -3, -2, -1, 0],
+		"gains": [4, 3, 2, 1, 0, 0, 1, 2, 3, 4],
 		"filters": [],
 		"last_au": null
 	};
 
+	var cfg = [ // hz, q, g
+		[31.25 * 0.88, 0, 1.4],  // shelf
+		[31.25 * 1.04, 0.7, 0.96],  // peak
+		[62.5, 0.7, 1],
+		[125, 0.8, 1],
+		[250, 0.9, 1.03],
+		[500, 0.9, 1.1],
+		[1000, 0.9, 1.1],
+		[2000, 0.9, 1.105],
+		[4000, 0.88, 1.05],
+		[8000 * 1.006, 0.73, 1.24],
+		[16000 * 0.89, 0.7, 1.26],  // peak
+		[16000 * 1.13, 0.82, 1.09],  // peak
+		[16000 * 1.205, 0, 1.9]  // shelf
+	];
+
 	try {
-		r.gains = jread('au_eq_gain', r.gains);
+		var gains = jread('au_eq_gain', r.gains);
+		if (r.gains.length == gains.length)
+			r.gains = gains;
 	}
 	catch (ex) { }
 
 	r.draw = function () {
-		var max = 0;
-		for (var a = 0; a < r.gains.length; a++)
-			if (max < r.gains[a])
-				max = r.gains[a];
-
-		if (max > 0)
-			for (var a = 0; a < r.gains.length; a++)
-				r.gains[a] -= max;
-
 		jwrite('au_eq_gain', r.gains);
 
 		var txt = QSA('input.eq_gain');
@@ -568,21 +577,36 @@ var audio_eq = (function () {
 			mp.acs = mp.ac.createMediaElementSource(mp.au);
 		}
 
+		r.filters = [];
+
 		if (!r.en) {
 			mp.acs.connect(mp.ac.destination);
 			return;
 		}
 
-		r.filters = [];
-		for (var a = 0; a < r.bands.length; a++) {
+		var max = 0;
+		for (var a = 0; a < r.gains.length; a++)
+			if (max < r.gains[a])
+				max = r.gains[a];
+
+		var gains = []
+		for (var a = 0; a < r.gains.length; a++)
+			gains.push(r.gains[a] - max);
+
+		var t = gains[gains.length - 1];
+		gains.push(t);
+		gains.push(t);
+		gains.unshift(gains[0]);
+
+		for (var a = 0; a < cfg.length; a++) {
 			var fi = mp.ac.createBiquadFilter();
-			fi.frequency.value = r.bands[a];
-			fi.gain.value = r.gains[a];
-			fi.Q.value = a == 0 ? 0 : 1;
-			fi.type = a == 0 ? 'lowshelf' : a == r.bands.length - 1 ? 'highshelf' : 'peaking';
+			fi.frequency.value = cfg[a][0];
+			fi.gain.value = cfg[a][2] * gains[a];
+			fi.Q.value = cfg[a][1];
+			fi.type = a == 0 ? 'lowshelf' : a == cfg.length - 1 ? 'highshelf' : 'peaking';
 			r.filters.push(fi);
 		}
-		for (var a = r.bands.length - 1; a >= 0; a--) {
+		for (var a = r.filters.length - 1; a >= 0; a--) {
 			r.filters[a].connect(a > 0 ? r.filters[a - 1] : mp.ac.destination);
 		}
 		mp.acs.connect(r.filters[r.filters.length - 1]);
diff --git a/copyparty/web/dbg-audio.js b/copyparty/web/dbg-audio.js
new file mode 100644
index 00000000..390a58f9
--- /dev/null
+++ b/copyparty/web/dbg-audio.js
@@ -0,0 +1,61 @@
+var ofun = audio_eq.apply.bind(audio_eq);
+audio_eq.apply = function () {
+    var ac1 = mp.ac;
+    ofun();
+    var ac = mp.ac,
+        w = 2048,
+        h = 256;
+
+    if (!audio_eq.filters.length) {
+        audio_eq.ana = null;
+        return;
+    }
+
+    var can = ebi('fft_can');
+    if (!can) {
+        can = mknod('canvas');
+        can.setAttribute('id', 'fft_can');
+        can.style.cssText = 'position:absolute;left:0;bottom:5em;width:' + w + 'px;height:' + h + 'px;z-index:9001';
+        document.body.appendChild(can);
+        can.width = w;
+        can.height = h;
+    }
+    var cc = can.getContext('2d');
+    if (!ac)
+        return;
+
+    var ana = ac.createAnalyser();
+    ana.smoothingTimeConstant = 0;
+    ana.fftSize = 8192;
+
+    audio_eq.filters[0].connect(ana);
+    audio_eq.ana = ana;
+
+    var buf = new Uint8Array(ana.frequencyBinCount),
+        colw = can.width / buf.length;
+
+    cc.fillStyle = '#fc0';
+    function draw() {
+        if (ana == audio_eq.ana)
+            requestAnimationFrame(draw);
+
+        ana.getByteFrequencyData(buf);
+
+        cc.clearRect(0, 0, can.width, can.height);
+
+        /*var x = 0, w = 1;
+        for (var a = 0; a < buf.length; a++) {
+            cc.fillRect(x, h - buf[a], w, h);
+            x += w;
+        }*/
+        var mul = Math.pow(w, 4) / buf.length;
+        for (var x = 0; x < w; x++) {
+            var a = Math.floor(Math.pow(x, 4) / mul),
+                v = buf[a];
+
+            cc.fillRect(x, h - v, 1, v);
+        }
+    }
+    draw();
+};
+audio_eq.apply();
diff --git a/docs/biquad.html b/docs/biquad.html
new file mode 100644
index 00000000..52322154
--- /dev/null
+++ b/docs/biquad.html
@@ -0,0 +1,95 @@
+<!DOCTYPE html><html><head></head><body><script>
+
+setTimeout(location.reload.bind(location), 700);
+document.documentElement.scrollLeft = 0;
+
+var can = document.createElement('canvas'),
+    cc = can.getContext('2d'),
+    w = 2048,
+    h = 1024;
+
+w = 2048;
+
+can.width = w;
+can.height = h;
+document.body.appendChild(can);
+can.style.cssText = 'width:' + w + 'px;height:' + h + 'px';
+
+cc.fillStyle = '#000';
+cc.fillRect(0, 0, w, h);
+
+var cfg = [ // hz, q, g
+    [31.25 * 0.88, 0, 1.4],  // shelf
+    [31.25 * 1.04, 0.7, 0.96],  // peak
+    [62.5, 0.7, 1],
+    [125, 0.8, 1],
+    [250, 0.9, 1.03],
+    [500, 0.9, 1.1],
+    [1000, 0.9, 1.1],
+    [2000, 0.9, 1.105],
+    [4000, 0.88, 1.05],
+    [8000 * 1.006, 0.73, 1.24],
+    //[16000 * 1.00, 0.5, 1.75],  // peak.v1
+    //[16000 * 1.19, 0, 1.8]  // shelf.v1
+    [16000 * 0.89, 0.7, 1.26],  // peak
+    [16000 * 1.13, 0.82, 1.09],  // peak
+    [16000 * 1.205, 0, 1.9]  // shelf
+];
+
+var freqs = new Float32Array(22000),
+    sum = new Float32Array(freqs.length),
+    ac = new AudioContext(),
+    step = w / freqs.length,
+    colors = [
+        'rgba(255, 0, 0, 0.7)',
+        'rgba(0, 224, 0, 0.7)',
+        'rgba(0, 64, 255, 0.7)'
+    ];
+
+var order = [];
+
+for (var a = 0; a < cfg.length; a += 2)
+    order.push(a);
+
+for (var a = 1; a < cfg.length; a += 2)
+    order.push(a);
+
+for (var ia = 0; ia < order.length; ia++) {
+    var a = order[ia],
+        fi = ac.createBiquadFilter(),
+        mag = new Float32Array(freqs.length),
+        phase = new Float32Array(freqs.length);
+
+    for (var b = 0; b < freqs.length; b++)
+        freqs[b] = b;
+
+    fi.type = a == 0 ? 'lowshelf' : a == cfg.length - 1 ? 'highshelf' : 'peaking';
+    fi.frequency.value = cfg[a][0];
+    fi.Q.value = cfg[a][1];
+    fi.gain.value = 1;
+
+    fi.getFrequencyResponse(freqs, mag, phase);
+    cc.fillStyle = colors[a % colors.length];
+    for (var b = 0; b < sum.length; b++) {
+        mag[b] -= 1;
+        sum[b] += mag[b] * cfg[a][2];
+        var y = h - (mag[b] * h * 3);
+        cc.fillRect(b * step, y, step, h - y);
+        cc.fillRect(b * step - 1, y - 1, 3, 3);
+    }
+}
+
+var min = 999999, max = 0;
+for (var a = 0; a < sum.length; a++) {
+    min = Math.min(min, sum[a]);
+    max = Math.max(max, sum[a]);
+}
+cc.fillStyle = 'rgba(255,255,255,1)';
+for (var a = 0; a < sum.length; a++) {
+    var v = (sum[a] - min) / (max - min);
+    cc.fillRect(a * step, 0, step, v * h / 2);
+}
+
+cc.fillRect(0, 460, w, 1);
+
+</script></body></html>
\ No newline at end of file
diff --git a/scripts/make-sfx.sh b/scripts/make-sfx.sh
index 30229a32..8821a7b0 100755
--- a/scripts/make-sfx.sh
+++ b/scripts/make-sfx.sh
@@ -167,7 +167,7 @@ find .. -type f \( -name .DS_Store -or -name ._.DS_Store \) -delete
 find .. -type f -name ._\* | while IFS= read -r f; do cmp <(printf '\x00\x05\x16') <(head -c 3 -- "$f") && rm -f -- "$f"; done
 
 echo use smol web deps
-rm -f copyparty/web/deps/*.full.* copyparty/web/Makefile
+rm -f copyparty/web/deps/*.full.* copyparty/web/dbg-* copyparty/web/Makefile
 
 # it's fine dw
 grep -lE '\.full\.(js|css)' copyparty/web/* |