diff --git a/Cargo.toml b/Cargo.toml
index f01e9cc..4fea557 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ hound         = "3.4.0"
 [dev-dependencies]
 microfft    = "0.3.1"
 num-complex = "0.2"
-jack        = "0.6.6"
+#jack        = "0.6.6"
 
 [lib]
 path       = "src/lib.rs"
diff --git a/src/dsp/helpers.rs b/src/dsp/helpers.rs
index eb5f784..1625196 100644
--- a/src/dsp/helpers.rs
+++ b/src/dsp/helpers.rs
@@ -456,7 +456,7 @@ impl TriggerPhaseClock {
     }
 
     #[inline]
-    pub fn next_phase(&mut self, trigger_in: f32) -> f64 {
+    pub fn next_phase(&mut self, clock_limit: f64, trigger_in: f32) -> f64 {
         if self.prev_trigger {
             if trigger_in <= 0.25 {
                 self.prev_trigger = false;
@@ -476,6 +476,7 @@ impl TriggerPhaseClock {
         self.clock_samples += 1;
 
         self.clock_phase += self.clock_inc;
+        self.clock_phase = self.clock_phase % clock_limit;
 
         self.clock_phase
     }
diff --git a/src/dsp/node_tseq.rs b/src/dsp/node_tseq.rs
index 94a3c6a..f4118b3 100644
--- a/src/dsp/node_tseq.rs
+++ b/src/dsp/node_tseq.rs
@@ -163,31 +163,14 @@ impl DspNode for TSeq {
             [0.0; MAX_BLOCK_SIZE];
 
         let cmode = cmode.i();
+        let plen  = backend.pattern_len() as f64;
 
         for frame in 0..ctx.nframes() {
-            let mut clock_phase =
-                if cmode < 2 {
-                    self.clock.next_phase(clock.read(frame))
-                } else {
-                    clock.read(frame).abs() as f64
-                };
-
             let phase =
                 match cmode {
-                    // RowT
-                    0 => {
-                        let plen = backend.pattern_len() as f64;
-                        while clock_phase >= plen {
-                            clock_phase -= plen;
-                        }
-
-                        clock_phase / plen
-                    },
-                    // 1 | 2 PatT, Phase
-                    _ => {
-                        clock_phase = clock_phase.fract();
-                        clock_phase
-                    },
+                    0 => self.clock.next_phase(plen, clock.read(frame)) / plen,
+                    1 => self.clock.next_phase(1.0, clock.read(frame)),
+                    2 | _ => (clock.read(frame).abs() as f64).fract(),
                 };
 
             phase_out[frame] = phase as f32;
diff --git a/tests/basics.rs b/tests/basics.rs
index 79b6447..0817ffa 100644
--- a/tests/basics.rs
+++ b/tests/basics.rs
@@ -785,11 +785,7 @@ fn check_matrix_tseq() {
     matrix.set_param(cmode_param, SAtom::setting(0));
     let samples = run_and_undersample(&mut node_exec, 2000.0, 5);
 
-    assert_float_eq!(samples[0], 0.4863);
-    assert_float_eq!(samples[1], 0.4731);
-    assert_float_eq!(samples[2], 0.4597);
-    assert_float_eq!(samples[3], 0.4463);
-    assert_float_eq!(samples[4], 0.4331);
+    assert_vec_feq!(samples, vec![0.70411, 0.90413, 0.99306, 0.97972, 0.966387]);
 
     // set to phase mode:
     matrix.set_param(cmode_param, SAtom::setting(2));
@@ -1038,3 +1034,79 @@ fn check_matrix_node_feedback() {
     assert_eq!(fft_res_r[0], (861, 224));
     assert_eq!(fft_res_r[1], (904, 206));
 }
+
+
+#[test]
+fn check_matrix_tseq_perf() {
+    use hexodsp::dsp::tracker::UIPatternModel;
+
+    let (node_conf, mut node_exec) = new_node_engine();
+    let mut matrix = Matrix::new(node_conf, 3, 3);
+
+    let sin = NodeId::Sin(0);
+    let tsq = NodeId::TSeq(0);
+    let out = NodeId::Out(0);
+    matrix.place(0, 0, Cell::empty(sin)
+                       .out(None, None, sin.out("sig")));
+    matrix.place(0, 1, Cell::empty(tsq)
+                       .input(tsq.inp("clock"), None, None)
+                       .out(None, None, tsq.out("trk1")));
+    matrix.place(0, 2, Cell::empty(out)
+                       .input(out.inp("ch1"), None, None));
+    matrix.sync().unwrap();
+
+    let freq_param = sin.inp_param("freq").unwrap();
+//    matrix.set_param(freq_param, SAtom::param(-0.978));
+    matrix.set_param(freq_param, SAtom::param(0.0));
+    let cmode_param = tsq.inp_param("cmode").unwrap();
+    matrix.set_param(cmode_param, SAtom::setting(0));
+//    matrix.set_param(cmode_param, SAtom::setting(2));
+
+    let pat = matrix.get_pattern_data(0).unwrap();
+    {
+        let mut pr = pat.borrow_mut();
+        pr.set_rows(16);
+        pr.set_col_note_type(0);
+        pr.set_col_gate_type(1);
+        pr.set_col_gate_type(2);
+
+        pr.set_cell_value(0,  0, 0x0F7);
+        pr.set_cell_value(4,  0, 0x100);
+        pr.set_cell_value(8,  0, 0x10F);
+        pr.set_cell_value(12, 0, 0x0F7);
+
+        pr.set_cell_value(0,  1, 0xFF1);
+        pr.set_cell_value(4,  1, 0xFF1);
+        pr.set_cell_value(8,  1, 0xFF1);
+        pr.set_cell_value(12, 1, 0xFF1);
+
+        pr.set_cell_value(0,  2, 0xFF1);
+        pr.set_cell_value(2,  2, 0xFF1);
+        pr.set_cell_value(4,  2, 0xFF1);
+        pr.set_cell_value(6,  2, 0xFF1);
+        pr.set_cell_value(8,  2, 0xFF1);
+        pr.set_cell_value(10, 2, 0xFF1);
+        pr.set_cell_value(12, 2, 0xFF1);
+        pr.set_cell_value(14, 2, 0xFF1);
+    }
+
+    for _ in 0..100 {
+        matrix.check_pattern_data(0);
+    }
+
+    let mut prev  : i64 = 0;
+    let mut first : i64 = 0;
+    for _ in 0..10 {
+        let ta = std::time::Instant::now();
+        run_for_ms(&mut node_exec, 10000.0);
+        let dur = std::time::Instant::now().duration_since(ta);
+        if prev > 0 {
+            let now = dur.as_millis() as i64;
+            if first <= 0 { first = now; }
+
+            //d// println!("{},{}", prev, now);
+            assert!((first - now).abs() < (first / 2));
+        }
+        prev = dur.as_millis() as i64;
+    }
+}